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The act of laying down on something, and flailing your arms and legs about to music, thus creating the effect that you are dancing.
(Laying on bed talking)

Kenzie: This is a good song!

Caitlin: I have to dance but im too lazy to get up...

Kenzie: Now is a time for Horizontal dancing!
by GoodCallGirls November 11, 2011
Gettin' jiggy with it

Barry Whitesque style term referring to the act of indulging in a bit of hide the sausage
"Let's turn the lights down low baby, have a little wine and later... do a little horizontal dancing"
by Lottycat February 27, 2009