YDKM = You Don’t Know Me (来源：英语杂志 http://www.EnglishCN.com)

Yep/Yup = Yes

YGBK = You Gotta Be Kiddin’

YMMV = Your Mileage May Vary

YNK = You Never Know

YOYO = You’re On Your Own

YR = Yeah, Right

YSYD = Yeah, Sure You Do

YTTT = You Telling The Truth?

YYSSW = Yeah Yeah Sure Sure Whatever