Undergarment which covers the lower torso including both butt cheeks; may or may not have an opening in the crotch; may have Velcro, snap, or ribbon-tie openings on the sides.
He was so scared, he had to change his seat cover. She doesn't want to die in a public place for fear that her seat cover will be soiled.
When a man has no condoms and the girl he's about to fuck isn't on birth control, but he still wants to cum inside of her. And so he pours soy sauceon his dick and in her pussy before fucking her in hopes that the salt content will be sufficient enough spermicide.