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1.
When 2 cars driving side-by-side preventing other vehicle passing.
Man, I was 15 minutes late this morning because I was stuck behind a pair of double daters.

Whats going with the traffic? I bet you someone is double dating.
by Pluckyj March 05, 2009
 
2.
to have multiple dates with different people, in a 24 hour span. Unlike "serial dating," it is specific to the two dates in one day - not an ongoing dating relationship with multiple people.
Guy1: What are your plans tonight?
Guy2: I'm double dating Kara & Veronica. Dinner with Kara at TheRestaurant, then picking up Veronica and getting drinks at TheBar.
by HeartsAndHangovers July 26, 2010
 
3.
Someone that is dating two people at the same time.In between monogamy and serial dater.
" I thought we were exclusive but I found out he's been double dating."
by nursekir December 04, 2008