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1.
to strike someone in the testicles with the intent to cause great pain. Best done when the victim is not expecting it
Bob: Hey Joe why you limping?
Joe: I made a jump shot and Tom ballchecked me
by Huff Dodger August 30, 2009
 
2.
Also known as a BC. When someone checks their balls to see if they've lost them or not.
Curtis Pressman did a BC (ball check) and found out that he lost them!
by Max Morell February 02, 2009