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1.
Two or more men together; four or more testicles; multiple sets of testicles.
Joe has testicles, but Joe and Richard together have testicli.

by foShizzle?! November 13, 2007
 
2.
1. The plural of testicles.
2. Multiple sets of testicles
1. I have testicles, he has testicles, we have testicli.
2. If you three fools don't stop harassing me, I will cut off your testicli.
by Michael/Benjamin November 12, 2007