While teabagging someone (putting your testicles over their eyes) you then shine a flashlight over your testicles giving your victim and IMAX-esque view of your testes and testicular veins. Made popular by eager high school students trying to find the vas deferens.

Also a cure for stuttering emo kids.
Matt and Dave walked in on Tom giving Chrissy a testicular eclipse. Shock therapy ensued.

Emo Danielle was given a testicular eclipse by peepants to cure her stuttering. Noone understands her angst.
by Davecolarusso January 28, 2008
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When you shoot nut and it aligns with the ceiling light and casts a shadow onto your dick.
Dude, the craziest thing just happened, I performed a testicular eclipse in my room!
by TheMagicalPenis January 21, 2019
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