To change the outcome of the night without intention, or screwing someone over.
Dude, you totally pulled a Bartman with us last night. You did as much for us as Bartman did for the Cubs back in '03.
by joebooh2 May 02, 2007
Being a complete and utter moron.
That guy's a total bartman.
by pater incognito October 15, 2003