When one's hair is all messed up in the back of their head do to friction from sex.
"I was so embarrassed when I had Sex Hair coming back from Peter's house!"

"Dude! Stacie has a major case of Sex Hair today!"
by Burt Macklin FBI May 16, 2015
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the kinky, mussed appearance that hair takes on after sex.
Sally buttoned up her blouse before the elevator doors opened, but she still was betrayed by her sex hair.
by Teighlorre November 7, 2006
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Itis the style of your hair after having amazing sex
Usually messy and sticking up on end
Mark:Yo Man did u screw shelly last night?
Jeff:Yah how'd you know?
Mark: well dude.. you have total sex hair!
by Rachel April 2, 2005
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other known as Misha Collin's hair, who plays the extremely sexy angel Castiel on the hit CW tv show Supernatural.
Person 1: "are you cosplaying Cas?"
Person 2: "Yeah howd you know?"
Person 2: "Youve got legendary sex hair, man!"
by unamoosed May 9, 2015
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Sex hair: (adj)describes unkempt, uncombed hairstyle made famous by actor Rob Pattinson and adored by women worldwide.
Rob Pattinson's sex hair dazzles me!
My boyfriend came home with sex hair and I knew he was not playing cards with the guys like he said he was.
by The Amazing Meow's Friend August 8, 2009
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Out of this world hair. Meaning also after how your hair looks like after sex. Many scene kids emo hardcore and electro kids use this term as having a devil lock or hair that is very unique.
It looks like anime hair, colors or not and also very long and with lots of gel
1:Ohh emm geee jhon i love ur sex hair <3
2:XThxX becky all that gel for just my hair ppl might say im an idiot but i think is ok
1:NO is so RADD like WOOOA
by steven C. V. July 17, 2005
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It sorta messy and sticking up.
sex hair-Joe Jonas has sex hair, its messy and looks even better when hes sweaty!
by gummybearlicker July 28, 2008
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