when you give a guy a blow job while he's doing a wallsit.
guy #1: dude, i got such a boner doing wall sits last night at the gym that i got some random girl to give me a wallie.
guy #2: bro, you're such a fratstar!
A distugsting word used to describe a dispicable act in which most humans wuld never do.
e.g throwing up all over your self whilist asleep molestering little children Doing a shit and stating that "its everywhere"
When a women is eating his own baby feutus
"ohh no she is chucking a wallie again"!
yo dude i was coppin a wallie with her at a the party, she was grindin so hard that I knocked down on of the pictures hanging on the wall, it was sick.