据我所知（AFAIK），老外不仅跟死党（BFF）发短信时喜欢用缩略语，跟陌生人网聊时也爱询问他们的“年龄性别所在地（ASL）”以及性取向（SorG）。如果我没记错的话（IIRC），你对这些缩略语还不怎么了解？不管怎样（IAC），赶快学起来吧！
词汇篇
b4 - before
y - why
u - you
ur - your
2 - to
gr8 - great
l8r - later
k - OK
thx - thanks
bf - boyfriend
gf - girlfriend
pls - please
ppl - people
sry - sorry
w/ - with
b/w - between
b/c - because
w/o - without
adr - address
f2f - face-to-face
短句篇
AEAP - as early as possible 尽早
ASL - age, sex, location 年龄、性别、所在地
ATM - at the moment 此刻，马上
AFAIK - as far as I know 据我所知
BFF - best friends forever 死党，永远的好朋友
BRB - be right back 很快回来
BTW - by the way 顺便问一句
FWIW - for what it's worth 不管有用与否（用在你给朋友提建议前）
G2G - got to go 要走了
IAC - in any case 无论如何
IDK - I don't know 不知道
IIRC - if I remember correctly 如果我没记错的话
ILU - I love you 我爱你
IMO - in my opinion 在我看来
JK - just kidding 开玩笑，别当真
KOTL - kiss on the lips 亲亲
LOL - laughing out loud 大笑
LMAO - laughing my ass off 笑得从椅子上掉下来
LMIRL - let's meet in real life 咱们见面吧
LMK - let me know 告诉我
LY - love you 爱你
MorF - male or female 男还是女
OMG - Oh my god 天哪
POS - parents over shoulder 父母在旁监视
RIP - rest in peace 愿逝者安息
RU/18 - Are you over 18? 你成年了吗？
SorG - straight or gay 异性恋还是同性恋
TBC - to be continued 未完待续
TBD - to be determined 有待决定
TMI - too much information 你透露的信息过多了（表示你认为对方不该说这些）
TTYL - talk to you later 待会儿聊
TY - thank you 谢谢
WTF - what the f*ck 什么玩意儿
WYCM - Will you call me? 你会给我打电话吗？
