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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
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