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The act of ejaculating in a woman's head of hair, causing a real mess.
Ronald gave Gretchen a sperm perm on accident. Her fault though, she should have caught it with her mouth.
by Stevie Y August 12, 2005
Its when a guy shoots a load of sperm in a girls hair, and she massages it into her scalp.
"Dude, i gave that girl the biggest sperm perm in the world last night."
by mc080290 December 15, 2006
When you blow your load on a rachet bitches curly, ass hair.
Matt: so how'd you and that Chelsea girl do last night?
Jarrett: Gave that bitch a massive Sperm Perm!
Matt: NICE!
by ovqZ January 14, 2014