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
by Danger Duck January 6, 2021
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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
by user646283 February 3, 2023
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A 8ft6 eshay that eats out of bins and smells like horsemanure
Wangy is pooca must be dumb
by rapist266 February 7, 2022
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