Grunt a load

(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