When you're having sex on the beach with your chick, and sand gets in her pussy, but you just keep goin. Her shrieks of pain are akin to the mating call of a howler monkey.
"Dude, i was doin this chick yesterday at the beach, but she got some sand in her vajayjay."
"What did you do?"
"Well, i just gave her an arabian sand monkey, but she was PISSED"