10xF: The resulting reaction from someone taking Ecstacy and (believing they are) going ten times faster than usual. Coloquial for going faster than usual ESP when breakdancing or making love.
Commonly associated with poor breakdancing skills and exagerated ability at copulation.
"Man his car is going fast - must have dropped some E in the fuel tank"

"I can go for 4 hours!"

"imagine THAT (refering to breakdance move) 10 times faster when i'm on E"
by HCB May 03, 2004

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