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1.
When a crowd of people surround a couple dancing on the dance floor, and the couple in middle perform dance moves similar to having sex.

Extreme Dirty Dancing.
Wow, those people are dance fucking are drawing a really large crowd.
by Xkuay March 05, 2010
 
2.
Dancing in a suggestive manner akin to having sex.
Leslie and John dancefucked all night long.
by Annemariee February 22, 2009