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Any powerful sensation of pleasure achieved before orgasm, especially during befornication. Could technically happen anywhere at anytime.

Alternate definition, a premature ejaculation. Perhaps experienced at a beforgy.
Girl 1: So how was Steve last night?
Girl 2: Oh he's so easy to please. I sucked on his ear for a second and you'd swear he had a beforgasm.
by tedophile March 10, 2010