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1.
(Noun)
A social engagement, like dinner, movies, etc., that two couples partake in.

A date that two couples go to.

(Verb: Double-date)
To partake in a double date.
(Noun)
"Hey, you want to take your boyfriend to a double date with me and my girlfriend?"

(Verb)
"Yeah, we double-dated with Nick and Maya, it was great."
by Nicktendo March 20, 2009
 
2.
Something you offer when your too nice to go out on a singles date with someone
"Dude, I asked her out and she said she would rather go on a double date"
by Mr. Diddlez July 19, 2014
 
3.
The use of two hands to jerk off
When I rub one out, I like to double date.
by DeezNutz February 19, 2003