Dewlap

[Britney]

The pendulous skin under the neck of an ox, which laps or
licks the dew in grazing.

[Mark Zuckerberg]

Sloppy fat beer gut, as in his belly do lap over his belt.

Loose skin hanging under the neck, especially of a cow.

[Becky]

A fat persons double chin. Originates from a term used to describe a pendulous fold of skin under the throat of a bovine animal

[Kai]

a fold of loose skin that hangs under the throat of a cow or a dog