A finishing move where the man grabs the woman by her hair, loads his testicles into her mouth and when he ejaculates, uses his free hand to take the tip of his penis and mash it against her forehead, splattering all in her hair and on surrounding objects. Can also be plural.
"You get any last night?"
"Yea but she was totally pissed when I Jase-squatched on her and ruined her drapes with the splatter."