Yo mama so fat, when she goes to get grapes off a bush, the bush says, "Bitch, I never thought they can grow that big!"
Grape Picking
Explanation
Explain Bear
Alright listen up, dummy. This joke is all about yo mama being so fat that even a bush is surprised by her size. The bush is like, "Damn, I didn't know grapes could get that big!" but really, it's talkin' about yo mama. Bushes don't usually talk, but you probably do to them, you weirdo.