Top Definition
Within seconds of achieving orgasm, a cockroach swoops right over your cock, causing you to jump and unload all over the place.
Example of someone having a Roachgasm:

You: "Eek...!" -moans/heavy panting-

Roommate: "WHAT!?!1one1?!"

-Awkward Silence-
by DomiNinja March 30, 2010

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