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1.
An orgasm for your head delivered by a "Headgasm" scalp massager. Only the best feeling in the world. Comparable to the feeling of a cold shiver down your spine, but on the top of your head.
That thing is like an orgasm, for your head! Headgasm!
von joell86 1. September 2010
 
2.
When your head gets all tingly, an orgasm of the head.
Dude I totaly just had a headgasm after that head massage my girlfriend gave me.
von Facehole19843422 4. Mai 2009