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1.
Event with an abnormally high amount of hoi, may refer to hoi in the sexual sense.

Ref: hoi is hoi as food is food
Hi! I'm here for the hoidown.
by IH April 27, 2004
 
2.
the act of going down on men with hoi
Karl is a fruit who gives out free hoidowns to his man-lovers on the weekends.
by fatman March 05, 2004