The sludge formed inside a Tim Horton's cup or in the case of parties, a cut-in-half pop bottle containing any combination of the following: water, coffee, spit, lung butter, dirt, ash, cigerette butts, beer. The contents, combined form a soil-like sludge emitting an awful stench. Time to change when all liquid has been soaked up by cigerette filters and the butts continue to burn once in side the cup. A short term fix is to spit on the individual butts. Warning this may induce gagging or vomitting. Do not inhale any air while attempting.
kev: time to open the garage door and air out this stink.
C: don't look directly into the cup.