guasa Share definition Flag In Puerto Rican slang, variously a stupid or moronic person, a pretender ("poser"), or a person the majority defines as "uncool." Ese tipo es un guasa./That dude's a guasa. guasa by The Red-Hatted Plumber November 5, 2005 0 0 Get merch Get the guasa mug. Buy Now — $32.95 See more merch