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1.
An unnatural hybrid of a bird and a turtle.

A type of mythological monster, for example the Japanese Kappa
Hey lady! That monster birdle just ate your baby.
by Monkey storm October 21, 2013
 
2.
used by my best friend's dad when he was in highschool to denote the male reproductive organ
My friend Matt has a very small birdle.
by babturtdiapunk October 11, 2004