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1.
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