Mondays

Proxy label for referring to a particular group or clique, be it geographic, socio-economic, racial, religious or what have you. Used to facilitate covert bigotry when in public. The group for which Mondays is proxied to is generally known by the audience using/listening to the term.

From joke - "know why group guys are called Mondays?" *why?* "well, no one likes a Monday."

White guys Tad & Chad are drinking, when a group of friends, all black (or brown, Asian, doesn't matter, T&Ch are assholes...) enter the bar. Tad says "Let's finish up before they change the music to all rap and hip hop." Chad replies "Shit, always the same; nobody likes Mondays."