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The sound made by rapid pelvic thrusting during coitus (sex). A synonym for having vigorous sex. Also the sound made by rattling furniture during vigorous coitus.
I couldn't sleep because my neighbors upstairs were up daga-dag all night!

Dude! Its their wedding night, of course they are gonna daga-dag!

I'm trying to get into her pants: daga-dag!
by The Spearmint Rhino April 24, 2011