When your boobs sags 3cm below the start of your boob without support, also defined as "when your boobs sag low and they wobble to and thro.
Betty White's tits are moopin hard.
39π 2π
Moopins disease is a disease which results in loud, random, often unexpected outbursts that cannot be explained by any normal behavioural patterns.
Dude 1: What was that?
Dude 2: Itβs ok, she has Moopins disease, she canβt control it.