Based on the search results, "popping a nut" can refer to two different things:
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Ruptured Testicle: This is a medical emergency that happens when the membrane holding the testicle breaks due to blunt force trauma or a penetrating injury. The testicle has a thin capsule called a tunic that ruptures, causing the innards to push out through the defect in the capsule. This looks like a cracked or disrupted egg, and the material oozes out. Treatment involves removing the material that is oozing out and then sewing the capsule shut.
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Squeezing Testicles: This is a slang term used to describe the act of squeezing ones testicles so hard that they "pop". This is usually done due to stress.
It is important to note that "popping a nut" should not be confused with ejaculation, which is a completely different process.
