Blend of Kos + cossack. From Daily Kos, which is derived in turn from Kos, nickname of the blog's founder Markos Moulitsas.
Kossack (plural Kossacks)
- (US, politics, Internet slang) A member of the progressive US blogging community Daily Kos.
2005, March 2, “Dean Barnett”, in Kos Party:
- Opined one Kossack: "His blood is also on Bush's hands."
2006, June 25, “David Brooks”, in Respect Must Be Paid:
- The Kingpin had instructed his Kossack cultists to support Brown's Democratic primary rival, Paul Hackett.