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1.
Double Downward is a theoretical sexual position in which two men simultaneously perform anal sex on eachother.
Frank: Hey Nick, have you solved the double downward conundrum yet?

Nick: Not yet, I keep trying and trying. It's so frustrating.

Frank: You know that makes you a faggot right?

Nick: Fuck you, I'm a scientist!
by HomeDogg420 October 27, 2009
 
2.
When you're jackhammering your boy while totally riding his pole.
I love doing the double downward a.k.a. the dick scissors.
by Jesus Baca October 29, 2009
 
3.
the simultaneous act of anal sex between two men
both guys being tops and bottoms at the same time is considered double downward. "yo me and boy just did doulbe downward"
by buttanut November 12, 2010