IwinIwin.com and IwinIwinIwin.com -- I Win! I Win! and I win! I win! I win!
Domain for sale at Afternic.com:
As of July 28, 2015, no live official trademarks were found on USPTO.gov for the exact term
I win! I win!
I win! I win! I win!
FYI: There are several trademarks on the single term I win.