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Random
Noun: The butt equivalent of boobs that look great in a bra, then go grandma-style when released.
I don't know, she looks good now but once those pants come down it's full on drop-ass.
This is when you are riding public transit and you offer someone your seat, only to stand next to them and fart directly in their face.
The kind young man offered his seat on the bus to an elderly woman. Moments later, the look on her face made it clear that she had fallen victim to the flip flop ass drop.