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(Us.) The process of 'whupping someone's ass' (beating them, usually in combat). Can be used in the term 'can of whupass'.
"I'm gonna open up a can of whupass on you, fool!"
whupass by Mad Walrus August 6, 2002
A can you would open up to kick someone's ass. Metaphorically.

Really it means, basically, to beat someone up.
"Boy ah' tell you what, if you hit that there snooze button one more time, ah'm goh have ta' open up a can'uh whupass, and you know ah'm goh do it too."
-a cowboy who threatens me if I don't wake up, after hitting the snooze button on my clock four times
whupass by Dave March 28, 2004
The process of causing harm to something or someone to the extent of causing significant damage, usually extensive. The process of inflicting a shitload of pain on a person.
That ninja opened up a can of whupass on those thugs who tried to mug him.
whupass by AYB February 19, 2003
The official drink of the Florida St. Seminoles, a powerhouse drink, used to shut out an opponent.
I sent a parcel of whup-ass to all of the Bears opponents of 2003-2004 season. The 49ners was the first recipient of it.
whupass by Saints September 8, 2003

Whupass Stick 

Dont forget your whupass stick!
Whupass Stick by wHuPaSsNesS May 13, 2005

can of whupass 

what stone cold opens when he is about to kick someone's ass
can of whupass by PlayDohMan May 10, 2004