g.p's is an acronym which stands for granny panies.
and if you don't know what granny panies are than you have two options, #1 look it up on the urban dictionary or #2 go through your grandma's drawers, im 100% you'll find one there!
-yo check out her g.p's they're puffing out of her pants like a parachute!
A song by the progressive rock band The Fall of Troy which is commonly thought to be the acronym for the phrase, "Fuck condoms. Premarital sex is the Shit. Get 'em pregnant, get 'em pregnant, get 'em pregnant," though the band has explained that the acronym has no particular meaning.