its my birthday 

A social phrase to tell someone to give you a present. because, it's your birthday.

Arny: its my birthday
Michael: So..
Arny: Ahem
Michael: OH YEAH, HERE BRO. -hands wads of cash from wallet-

its my birthday by CRUNKBEAST December 19, 2009

It's my birthday 

An expression of delight, accompanied by dancing around. Basically saying that the person in question is great, skilled, lucky, etc.

Ususally said in a kind of sing-song way.

"Ooooh yeah! I just won that race! It's my birthday! It's my birthday!"

It's my birthday by Athene Airheart March 20, 2004

it's my birthday NIGGA 

a loud proclamation said by someone when it is their birthday, usually highlighted by said someone forcing a door open with their foot

It was quiet in the house, when all of a sudden Steve busted the door open and yelled :

"it's my birthday NIGGA."

Everyone immediately gave Steve all their money from their respective wallets.

it's my birthday NIGGA by Galbert-Kun April 4, 2009

it's my birthday 

Used by either sex to trick the other party, (usually in a bar)into purchasing you a drink, or perhaps used to elicit some kind of sexual favor later on in the evening.

"How's it going? It's my Birthday tonight!! Oh you wanna buy me a shot?!"

it's my birthday by SOB December 9, 2004