1. (noun) A young buck, annoying Probby
2. (noun) useless extreme sportsman who hurts himself more than Mr Bean in a minefield.
3. A rallying cry of support for any remotely extreme physical exertion / phenomena
1. Piss off and stop bugging me Xtreem
2. Wooah did you see how that Xtreem mashed himself up when he tried to jump over 24 double decker buses on his mountain bike?"
3. "woah did you see that awesome olly?? Xtreeeeem!!"