look up any word, like fleek:
This is a slang word for penis. Term often used when boys are acting foolish. Commonly used when one is describing his little friend.
(While amongst friends, Matt yells "Smack Your Birdy Pie" and slaps the crotch of his jeans.)

(Bobby sometimes entertains classmates with the use of the word Birdy Pie.)

(One certain kid always played with his Birdy Pie in the back of the bus while on field trips.)

by Eaglet81 December 09, 2007