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1.
one who has achieved a high level of excellence
Dang, that broad can sell... she's a top bird.
by Cbo August 14, 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."
by Porkponcho January 05, 2012