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To shave one's head unexpectedly, whether it's by choice (a la Britney Spears) or otherwise.
Example 1:
Girl: Did you see Claire's hair, or lack thereof? She Britneyed it all off!

Example 2:
Frat boy 1: What the hell happened to my hair?
Frat boy 2: Dude, you got Britneyed while you were passed out.
by SidewalkSam April 29, 2007
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A sexual act, in which you shave your respective partners head then ejaculate and rub it into the scalp. Meanwhile saying "Its Britney Bitch".
I picked this chick up off tinder, and she got Britneyed by me. She had no idea what she agreed too.
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by Britneyed June 15, 2017
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