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1.
lowbird. This is a term used to describe a low skilled player, aka a noob.
1. Skilled player : "omfg lol lowbird noob ja ja ja ja."
2. Skilled player : "rofl @ that ct tbqfh what a lowbird"
3. lowbird : "OMG HOW DEFUSE!!!!??"
4. lowbird : "OMFG WHY U FUCK WITH MY CONFIG!"
by the Unknown CPL October 30, 2006
 
2.
The act of flipping someone off while driving by them, with your hand placed lower than your car dash, where the person is unable to see you flipping them off. Customary to say emphatically, "I totally flipped that guy(girl) off"
Yeah buddy, been driving around giving the lowbird all day
by Miles Deem September 03, 2010