Upstaging or one-upping a competitor or opponent.
Did you see that debate last night? Obama TOTALLY big timed Hillary.
by Dominic D April 17, 2008
1 more definition
When one person whom you know, acts like they are too cool to say hi or acknowledge your existence.
You were with your friends at dinner and you big timed me.
by Don Kershaw December 11, 2007