Derived from godwin. Typically used on UseNet and Internet chat forums, to Bushwin a thread or topic is to make reference to George W. Bush, his presidency or his administration in general, which has the effect of derailing the thread and completely changing the intended subject. The person "bushwinning" a thread is usually suffering from some form of Bush Derangement Syndrome.
CollegeGrrl: I read that book for my American Lit class
BDSBob: I bet that lying Chimpy McFlightsuit never read it.
Randroid2112: Wow, Bushwinned in three entries -- you win the internet, Bob!