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1.
a phrase questioning one's manhood and/or ability or opportunity to complete a task improving one's "manhood status".

Similar to phrases like:
"Suck it up!"
"You suck!"
"Be a man!"
"I think I'm going to go to bed early tonight..."
"SACK CHECK!"
by theDane55 May 09, 2008
 
2.
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!
by Aerodicus February 18, 2011