It sounds like you're referring to a of the popular sandbox mobile game Dude Theft Wars —likely a fan-made "Fvnky" (funky?) mod pack that adds crazy weapons, vehicles, skins, or meme behaviors.
Dude Theft Wars Fvnky Mods Info
It sounds like you're referring to a of the popular sandbox mobile game Dude Theft Wars —likely a fan-made "Fvnky" (funky?) mod pack that adds crazy weapons, vehicles, skins, or meme behaviors.