Top Definition
(verb) To ejaculate; expel a load of semen.

From the sound a man makes during an intense orgasm.
Not only will I ride bareback; I'm planning to grunt a load into her ass.

Can also be shortened to "grunt," as in:
"I went out with that girl from work last night."
"Did you grunt?"
by Wicked Cousin March 13, 2010

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