pillow pants can be used as a verb or an adjective describing a person.
As an Adjective: A person who on more than one occasion has prevented a sexual act from occurring.
As a Verb: The act of preventing a sexual act from occurring.
The term itself comes from the film, "Clerks 2" in which the pillow pants is a troll living in a girls vagina that bites off a guy's penis if he tries to have sex with her before her 21st birthday.
Adjective: That guy is a pillow pants! he walked in just as i was taking her shirt off!
Verb: I totally pillow pantsed my brother yesterday. I walked in just as he was taking her shirt off!
A pussy internet troll. Someone who creates a fake account on social media to troll with. They post things they wouldn't dare say in real life feeling safe in their anonymity. A pillow pants could also use their real name but simply never use an actual picture in fear of real life consequences of their trolling.
Don't get bent out of shape over that pillow pants, he's just a pussy troll.
A man who’s hands don’t specifically resemble a pillow, but if he hits you, it’ll either put you to sleep or be quite comfy and feel like you’ve put your head on a pillow. Generally this guy is an weapon and should only be attacked from behind with a bootyhole lick.