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3.
A birder is a lad who laps up attention off the ladies and thinks of themselves as pretty much a big deal. Probably quite good looking, but more importantly, thinks that they're the fittest thing to ever walk the earth.

Birders will always have several girls on the go, and probably have different names for all of them. E.g 'wifey', 'baby girl' or 'boo' - this keeps all the women feeling special and thinking that they're the only 1
Girl 1: "Hey, u heard of that josh evans?he seems pretty cool"
Girl 2: "Yeah- a big time birder, don't go there babe"
by La Horndog TM January 14, 2010
 
1.
A species of bird watcher. Not as fanatical as a twitcher. A bird will find hours of entertainment sitting by a window or in his car watching the behaviour and interaction of various species of birds.
My father was a birder, he would sit for hours staring onto the garden watching the flocks of chaffinches that thronged to his feeding table.
by black flag June 05, 2004
 
2.
The ultimate player
Why is Johnny always getting the best girls?
He's a birder - simple
by Ollatron April 30, 2011
 
4.
An act of killing a Bird (any type of bird - Eagle, Seagull, Pigeon) in any way (Hitting it with a car, Making it explode, Kicking it) with the intent of killing and to ends its life. For the Human definition see murder
A bird was found dead today, police suspect birder.
by cc2k September 26, 2009