a badunkadunk butt
A girl with so much junk in the trunk, it’s like she’s carrying a whole bag of groceries in her butt.
My friend’s butt is so big, it’s like she’s got a backpack full of snacks in there.
She walks like she’s got a donkey in her trunk.
I told her she had junk in the trunk, and she said, 'Thanks, I was hoping someone would notice.'