A foam party is a social event in which participants dance to music on a dance floor covered in several feet of suds or bubbles dispensed from a foam machine
Foam parties can be dated back to A Rhapsody in Black and Blue, a 1932 short subject directed by Aubrey Scotto[1] where Louis Armstrong dances, sings, and plays his trumpet in a large area of soap suds. Songs performed in the foam are “I’ll Be Glad When You’re Dead, You Rascal You” and “Shine”.[2] Another film featuring foam parties is The Party[3] featuring Peter Sellers.
https://en.wikipedia.org/wiki/Foam_party
A foam party is a social event in which participants dance to music on a dance floor covered in several feet of suds or bubbles dispensed from a foam machineFoam parties can be dated back to ...
That's a pretty sterile Wiki definition but it doesn't really match that photo of naked ( or at least topless ) men!
Also, a quick glance at that pic tells me there are definitely some 'mo's in that mess. ( not that there's anything wrong with that :-)