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Sack check 

The flicking of a buddy's testicles, (similar to how one packs a can of chew) who is spacing out, or who answers you correctly when asked "What city is the Capitol of Thailand."
Johnny was spacing out when Dave asked which 40 he wanted us to get him so he got sack checked!
Sack check by Aerodicus March 5, 2011

check your sack 

To determine the presences of one's testicles; To man up
Coach always knew how to motivate us:

"Hey! Check your sack and stick your dick in the electric fire!"