What does whoop mean in slang?

a loud cry, esp one expressing enthusiasm or excitement. med the convulsive crowing sound made during a paroxysm of whooping cough. not worth a whoop informal worthless. SEE MORE. See also whoops.

What is the difference between whooping and whopping?

Whopping (pronounced “wah-pihng”) is an adjective. It is used to modify astonishingly high dollar amounts. Whooping (pronounced “woo-pihng”) has multiple meanings. As a verb, it means to make a loud cry.