A term of encouragement often used to drunkenly encourage equally intoxicated acquaintances. Rarely used on the subject of encouragement's actual birthdate. Commonly preceeded by "Go (name)" and occasionally followed by, "no it's not, go anyway" when spoken by those in the 8-13 year old age bracket (who are hopefully not drunk).
"Look, Susan's about to dance on the bar!"

"Go Susan, it's your birthday!"
by Birthday Girl March 25, 2004
What occurs when you are expelled from your mother's uterus.
When I was born, the doctor slapped my ass and said "Boy, it's your birthday."
by Ann Hedonia August 1, 2004
The only occasion on which short people are allowed to participate in certain activities, like pick-up basketball games or parties.
(Gary Coleman's birthday)
Gary Coleman: "Yo 50, is it cool if I go to that big party you're throwin' next tonight? G-G-G-Unit."
50 Cent: "Go shorty, it's your birthday."
by Nick D July 14, 2004
when something really cool happens to you, it's your birthday
You aced the exam! Go shorty, it's your birthday.
by Estela Lopez March 25, 2004
A lyric from 50 Cent's (from G-Unit) song In Da Club. It is now used as a term of endearment between homies.
Lyric: Go shorety, its your birthday, we gon party like its your bitheday.

Endearment:
Homy 1: Aight man, peace
Homy 2: Yea, its your birthday!
Homy 1: Thanks man.
by Yo Mama's Pork March 26, 2004