That's totally wack for yo', understand. An especially 1337 way of saying someone screwed up really bad
Guy: Man I totally ditd that midget the other day
Friend: Dude, ttwfyu
That's totally wack for yo', understand? An especially 1337 way of saying your friend pulled some fucked up shit
Friend: I can't believe I fucked that wheelchair chick, it was so good
You: Man, ttwfyu?