SMS 言語

As far as I know

/æz fˈɑːɹ æz aɪ nˈoʊ/

N/A

名詞

used in a text message, email, etc. to express one's doubt while giving an opinion

BF

/bˌiːˈɛf/

(ボーイフレンド)

彼氏（かれし）

名詞

(especially in text messages, on social media, etc.) a male partner that one has a sexual or romantic relationship with

GF

/dʒˌiːˈɛf/

(ガールフレンド)

彼女（かのじ）

名詞

(especially in text messages, on social media, etc.) a female partner that one has a sexual or romantic relationship with

Be right back

/biː ɹˈaɪt bˈæk/

(ちょっと待って)

すぐ戻る

名詞

used in online conversations indicating that one would be back after a short time

DD

/dˌiːdˈiː/

(娘っ子（むすめっこ）)

娘（むすめ）

名詞

used in online conversations referring to one's daughter

DW

/dˌiːdˈʌbəljˌuː/

(妻 (つま))

嫁 (よめ)

名詞

used in online conversations referring to one's wife

I don't know

/aɪ dˈoʊnt nˈoʊ/

(わからない)

アイディーケー

名詞

a common abbreviation used in texts or online conversations, which means one does not know something

Laugh out loud

/lˈæf ˈaʊt lˈaʊd/

(爆笑)

大笑い

名詞

used especially in text or online messages to express laughter or amusement about something funny

LOLZ

/lˈɑːlz/

(草)

笑

名詞

used in texts or online messages about something that is funny and amusing, expressing laughter

MYOB

/mˈaɪɑːb/

(干渉しないで)

余計なお世話をするな

名詞

used in text messages, emails, etc. emphasizing that someone should not interfere in other's lives

Obvs

/ˈɑːbvz/

(当然)

明らかに

名詞

especially used in text messages, emails, etc. indicating that something is clear and easily understood

TL;DR

/tˌiːˈɛl dˌiːˈɑːɹ/

(結論として)

要約すると

名詞

used in a text message, email, etc. as a dismissive response to a long post or text or to give a summary

YOLO

/jˈoʊloʊ/

(人生は一度きり！)

一度きりの人生！

名詞

an abbreviation commonly used in online conversations and social media posts to encourage living life to the fullest and taking risks

Cul8r

/sˈiː juː lˈeɪɾɚ/

(またね (Mata ne))

じゃね (Ja ne)

名詞

an abbreviation commonly used in text messaging and online communications, often used as a quick and casual way of saying goodbye or indicating that the person expects to see the recipient again soon

IRL

/ɪn ɹˈiːəl lˈaɪf/

N/A

名詞

an abbreviation commonly used in text messaging and online communications, often used to distinguish between online or virtual interactions and interactions that take place in person or offline

NP

/ˌɛnpˈiː/

(ノープロブレム)

大丈夫 (だいじょうぶ)

名詞

an abbreviation commonly used in text messaging and online communications, often used as a quick and casual way of acknowledging a request or expressing that something is not an issue

OMW

/ˈɑːmwə/

(今向かっているところ（いまむかっているところ）)

向かってるよ（むかってるよ）

名詞

an abbreviation commonly used in text messaging and online communications, often used as a quick and casual way of letting someone know that the sender is en route to a location or event

Too much information

/tˈuː mʌtʃ ˌɪnfɚmˈeɪʃən/

(知りすぎた)

情報過多だ

名詞

used in written or spoken conversations to indicate that someone has shared more personal or detailed information than is comfortable or necessary

Laughing my ass off

/lˈæfɪŋ maɪ ˈæs ˈɔf/

(腹を抱えて笑う)

大爆笑

名詞

an abbreviation commonly used in text messaging and online communications, often used to express that something is funny or amusing

Gr8

/ˈɡɹeɪt/

(いいね！)

すごい！

名詞

an abbreviation commonly used in text messaging and online communications, often used as a quick and casual way of expressing approval, satisfaction, or agreement

WYD

/wˌʌt ɑːɹ juː dˈuːɪŋ/

(どうしてる？ (Doushiteru?))

何してるの？ (Nani shiteru no?)

名詞

an abbreviation commonly used in text messaging and online communications, often used as a way of starting a conversation or checking in with someone to see what they are up to

By the way

/baɪ ðə wˈeɪ/

(または)

ところで

名詞

Collocation

used to introduce a new topic or information that is related to the ongoing conversation

As soon as possible

/æz sˈuːn æz pˈɑːsəbəl/

(なるべく早く)

できるだけ早く

名詞

Collocation

used to express the urgency or immediacy of completing a task or taking action without unnecessary delay

TTYL

/tˈiː tˈiː wˈaɪ ˈɛl/

(またね！ (Mata ne!))

じゃね！ (Ja ne!)

名詞

used in online messaging, texting, and email as a friendly way to indicate that the conversation is ending but the speakers will communicate again in the future

For your information

/fɔːɹ jʊɹ ˌɪnfɚmˈeɪʃən/

N/A

名詞

used in written or spoken communication to indicate that the information being provided is intended to inform the recipient, but not necessarily requiring any action on their part