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It is a sex move. Receive road head from a female, drive and accelerate very quickly and drive as fast as possible over a speed bump. Then when the cars front tires return to the asphalt, you penis will spear through the back of the girls skull.
Yo she was being such a bitch but she was in that rude mood ya know. Perfect opportunity to spearhead that hoe.
Spearhead by wgaccione January 3, 2019

Everest Spearhead 

When a male, preferably at a high-altitude, freezes his ejaculatory fluid into the shape of a spear. This spear is then used to stab his female partner, making a decent sized wound. The male then proceeds to have sex with the wound, as if it were a vagina. Medical assistance is often needed afterwards.
"Dude, did you hear about Amber? She's in the hospital!"
"Yeah man, she tried the Everest Spearhead, and it didn't agree with her"

"Man, I'm tired of vagina's"
"You should try the Everest Spearhead technique, it's so much better than a vagina!"

Cincinnati Spearhead 

The act of after nutting inside a woman, putting a morning after pill inside your own mouth, crunching it like a nazi’s cyanide tablet, and then spitting it inside a woman’s mouth.
Fuck man! I nutted inside her, but with some quick thinking I remembered to give her a Cincinnati spearhead!
An avid baseball fanatic, especially one who frequently utilizes statistical analysis and urges others to do the same.
Old-school baseball scouts tend to hate seamheads like Rob Neyer, always harping about on-base percentage and Win Shares.
seamhead by Travis M. Nelson March 20, 2008

Scarhead 

An obsessive fan of the Harry Potter series. Scarheads participate in the "HP" fandom through activities such as writing/reading fan fiction, listening to wizard rock, attending symposiums, etc. Also called Potterheads.
Scarheads have more fun than Parrotheads and Deadheads.

I have been a Scarhead since I was twelve.
Scarhead by queenofwands March 31, 2008
Somebody who is your boy but kind of slippery.
Yo, I know that boy Gadzüke- he woke AF but he kinda a smearhead. I saw him shoving slim Jim’s down his trousers at the dollar store.

Fecus’s boys called him a smearhead after he dined and dashed at the local Arches.
smearhead by GerthPaul November 24, 2020