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It's a combination of sweat, tears, spit, urine, feces, blood, plasma, drug particles, bile, vagina juice, semen, pimple-innards, puss, slime, smoke, debris, lint, hair, skin, cheese (and similar food particles), fingernails, wax, lymph, water, alcohol, soot, paint and indentifiable residue that coats everything the day after a rave.

Rave goo is not, of course, specific to raves. Just living with something long enough without cleaning it can accumulate some form of rave goo.
My keyboard, when finally cleaned after years of taking my computer to parties, was completely saturated in rave goo.
by Denis A. Baldwin June 06, 2006