Purple head is when a girl pulls on a guy's dick so hard while sucking that it causes his head to turn purple.
My girlfriend Debra and I wanted to take our relationship the the next level last night and so she asked me if she could suck my dick. Since I was feeling horny, I pulled my pants down to my ankles and let her do her job. She started to suck on it and felt good. Ten minutes later, it started to get rough and so she took her hand and gave my dick a good tug. She pulled on it so hard that I screamed. My face turned purple. It was the worst night of my life. Purple head really hurts.
Some faggot who sits in front of you in AP english class who's hair is so long you can't see around it. His hair is known to be so long it could be used to mop a floor.
"hey you fucking mop head cut your gay ass hair I can't see past you."
"Dude get a fucking haircut. We don't even know if your human you fucking mop head."