good-time buddy
One or more associates or confidants that an individual has to pass the dreary time away in the work environment or more obvious social occasions.

The nature of the conversations between the good time buddies is one of harsh cynicism and usually of a defamatory nature where the onus is on criticising the universe at large. They tend to use cryptic terms that can only be deciphered by non-participating third parties by obtaining the enigma machine.

Please note: Good-time buddies are not necessarily having a "good time".
MFQ: "Do you see those 2 cocksuckers? They walk around the building laughing!"
MILF: "Yeah, they're good time buddies."