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 1, 2010
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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 4, 2009
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A momentary ADHD moment in your head where piles loads of good ideas over each other, lasting for a minute or two; usually when planning something one is overly excited about
"This writer must have been on something strong while planning this!"

"No, just multiple headgasms."
by thelitttleone August 4, 2017
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