What is Owtf?
1.
Owtf= Oh, what the fuck?
Usually used to show surprise.
Guy1: Oh, by the way. I slept with your wife.
Guy2: OWTF!?
Guy1: Yeah, we got pretty drunk, and when we woke up next to each other in the morning we were both like "OWTF!?"
See
2.
the alternate way of saying Oh, What the fuck?
Person 1:owtf, you did not get get pwnt.
Person 2: Yep, I got PWNTZ.
Person 1: Go pwn yourself, n00ber.
See