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1.
one who has achieved a high level of excellence
Dang, that broad can sell... she's a top bird.
af Cbo 14. august 2006
 
2.
Derived from the acronym T.P.B.I.R.D. which stands for "That poor boy is real dumb." A term typically reserved for the least intelligent individuals on the planet or those born after 1980.
"Hey did you see that interview with with Plaxico Burress, he sure is Topbird."
af Porkponcho 5. januar 2012