pissbum is what happens when u go camping and you need to piss in the bush and u laugh and get it all over your pants instead.
it is also emma's nickname.
oi pissbum, i can't believe you piss bummed again!
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.