it's your birthday

yay for you

you get a prize

it's your lucky day!

you did good

I like you

you like that don't you

jack: omigod dottie, bobby-jean liked my film
and wants to screen it opening night!

dottie: It's your birthday! hay hay.

it's your birthday by Dottie March 23, 2004

it's your birthday

Birth-day, hence conception-day, hence you're getting sex tonight.

"go shorty, it's your birthday." - 50 Cent

it's your birthday by ghoatie March 26, 2004

its your birthday 

Used by rappers and dorky white kids, its your birthday means that you have completed something and your friends (if you have any) and proud of you, resulting in them saying "its your birthday" meaning "Congrats! You've done some ordinary thing that many other people do, but I'm going to use the phrase "its your birthday" to sound cool, and hip, because I saw it on MTV!!!!"
Yeah.

White Guy 1: Oh my golly, I do believe its your birthday, gee, go you!
White Guy 2: Aw, shucks thanks, teehee.

its your birthday by DoomedMonkey December 6, 2004