Guy 1- "Dude, class just ended, why are you still sitting there?"
Guy 2- "Well, I've been staring at Chelsea's tits all class, and I'm still rocking some serious timber!"
a reference to the Pitbull song TIMBER FT. Kesha, often said by white girls at school like but not limited to Wake Forest University . It is the female equivalent to "lets get wired". The phrase "I am going timber" as active meaning of partying, drinking, dancing, while excluding smoking weed.
A sex position. Basicallydoggie style, but right before the guy cums, he pulls the girls' arms out from under her yelling "timber", causeing her to fall on her face.