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.
The little troll that parents put into their daughters pussy that keeps them from having sex. If a penis enters her vagina, pillowpants will bite it off. Pillowpants is peed out on her 21st birthday.