Acronym for "what the hell is that", expression used to express derision for someone's statement, idea, looks or sense of style. Used in emails, texts, blog entries.
Jack: I think Everton are going to get a CL spot this year.
Person 1: did you rememeber that you can get a free slurpee today?
Person 2: Not thank you, I dont want a slurpee...
Person 1:I did not say I was going to get you one, just to remind you that there free today "WTHITMWU"
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi