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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.
by Facehole19843422 May 04, 2009
 
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!
by joell86 September 01, 2010