Mush I took those research chemicals you gave me last night whilst I was watching Eastenders and I was so skapped I thought Jane Beale was trying to flirt with me.
one step above being pwnd, it's derived from "skunk humped"... clearly something you don't want to happen. unlike pwnage, which may not be noticed by the victim, you ALWAYS know if you've been skumped; it has to be public and uber-humiliating.