Usually, a pet name given to a boy called Lucas, mostly by Lucas's older siblings.
Poo (shit) + Lucas = Poocas
Other variations include Mucus and Pukecas
Older sibling: hi Lucas - or should I say poocas?
Lucas: stfu before I snitch on u
An extremely offensive slur that means you are stupid, homophobic, and are in relations to poopoo and caca.
Carl says You suck
I say shut up you pooca
carl; *is embarrassed and took extreme offense