When one (the "phluncher") vomits over someone (the "phlunchee") before
punching them
in the head in order to escape whilst the phlunchee comes to terms with the phlunching.
Normally used when there is a) a there is a extreme need to vomit b) no unoccupied toilets. Clubs are prime phlunching spots.
Phlunchee: "Ah man, I was so drunk
the other day, went to the toilet
in the club and was sitting there
taking a dump when this guy bursts in and vomits over me!"
Friend: "What?! Did you hit him?"
Phlunchee: "I couldn't! He hit me first! I had to recover, wipe my ass, clean the vomit and then go and find him, but he'd run away by then!"
Friend: "Dude, you got phlunched pretty hard"