During sex your partner put a finger in your butt, to help you achieve orgasm.

It can be as deep as a prostate massage, or just circling close to the entrance.

The origin might be from the Brazilian fio-terra.
Male 1: How was the date with Female?
Male 2: It was great. When I was about to come she ground wire me. I came like a fountain.
by Eunuco February 1, 2020
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a woman in a menage a trois involving homophobic men
Jill offered to be Bill's hetero ground wire in a menage a trois involving Bill's coworker Stan.
by purple phaedrus May 15, 2008
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