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1.
An orgy of homeless people derived from a portmanteau of "hobo" and "orgy."

A common occurrence at public parks, train stations, dark alleys, and an other place hobos are known to congregate.
Hey there foxy (bag)lady, are you here for the hoborgy?
by Jonny B. Gewd November 10, 2008
 
2.
Group sex exclusively involving transients or hobos.
When the box car is a' rockin', don't come a' knockin'. That is, unless you want to join in on the hoborgy that is going on in there.
by Htos_Drol March 02, 2014