Quack is a word that can mean many things. It is the sound a duck makes, it can be an insult, & it can be a punch line.
Duck: quack
Angry human: what a quack!
Funny human: your just quacking me up!
A very sexy sound when moaned by a girl.
guy: so what do ducks say?
girl: ...quack.....
Quacking; to be afraid of something like a duck after a gun is shot.
“I’m coming for your job mate.”
“Oh no I’m quacking!”
“I’m quacking at the thought that our president will ruin this country.”