\`whoop '
ass\ n.
A dangerous substance, usually found packaged inside
cans. When released, can cause major damage to the person it is intended for, and is often used as a weapon of destruction. More often the
user warns the recipiant of an imminent opening of a can, if the recipient does not act as desired by the opener.
"If you don't shut up i'm gonna open up a can of
whoop ass!"
"If you go ahead with that plan, you'
re gonna see me open up a can of whoop ass on you!"