An annoying anti-aircraft vehicle (ZSU-23-4, a.k.a. Shilka) in Armed Assault 2 (ARMA 2), always manages to lock on and destroy your aircraft at the most annoying times. Can also be pronounced Shitkah or Shitcar.
"Alpha-One engage that skitka 12 o'clock low"
"Copy that Alpha-one, engaging, shit Im hit, I'm hit damn shitka!"