1. An uncommon insult that generally makes others laugh at the person being insulted.
2. Commonly used insult in US Navy bootcamp in Great Lakes, IL. Named after those little friggin Shit Birds that hop around all day, just eating and shitting. Eat, and .... SHIT. Eat and friggin Shit. They never sing, always shitting where you're about to do push-ups and even if you happen to stomp one, they're not big enough to eat. Damn shit birds.
Bootcamp company commander at 4am....
Wake you bunch of fucking shit birds! Get out of them racks. Recruit where are you going?
Recruit responds: to take a piss sir.
CC responds: I bet you'd like to take a big shit in there too and afterwards stroll off for some nice hotcakes and eggs. Well you ain't you fucking shit bird! Now get back in line.