When you see something on 4chan that you can never unsee.
Guy 1: Dude, last night I just saw a picture on 4chan of a chick cut open and a guy cumming in her!
Guy 2: Oh, that is so un4chanate.
Taken from unfortunate and 4chan
It's what you are if you spend too much time on 4chan.
Tim: Want to go to the bar tonight?
George: No I'm just going to be on 4chan tonight.
Tim: You are so un4chanate.