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1.
When someone does something stupid, or something back fires, or anything negative happens, a sick beak is in order.

Origin: Calgary, Alberta. Joey Laslo, and Corey Watts.
Cameron: Joey just downed an entire bottle of tequila and is vomiting on your bed!

Nate: FUCK!

Cameron: ahahah sick beak.
by Joey Laslo January 11, 2009
 
2.
The phrase often said when two people are making mean comments back and forth (beaking) and one of the two lands an amazing comeback or gives out a good one it is referred to as sick beaks.
A cripple: get your ass out of the way im trying to get threw here!

a guy: shut it dead legs im going

the cripple: Hey asshole i may not be able to move my legs but at least i have all THREE of mine.

The cripple just landed a SICK BEAK

The cripple if he had a friend would most likely yell "oh man, "sick beaks"
by SHAVE MY BANANA PLZ June 24, 2009