In France French, “gosse” means kid; In Quebec French, it means testicle (sort of like saying “the boys”, I suppose). Anyway, this leads to occasional misunderstandings, as exemplified by the following joke:
Frenchman: Embrasses-tu tes gosses avant de te coucher ? (Do you kiss your kids goodnight before going to bed?)
Quebecer: J’ai-tu l’air d’un acrobate, moé ? (Do I look like an acrobat?)
Popozão is indeed Brazilian slang for “big butt”. It actually comes from the German “popo” (kiddie talk for butt) and the standard Portuguese ending of -ão for an augmentative.
Other Brazilian slang words for a “big butt” would be “bundão” (from “bunda” for butt) or “bumbumzão” (from “bumbum” for butt).
Why yes, most Brazilian men are indeed butt men. 
The classic Brazilian beauty used to have a bubble butt, strong thighs, and small perky breasts. Lately silicone has also made its inroads into Brazil, and larger breasted women are no longer ridiculed.
I knew there had to be someplace I’d be hailed as goddess! 