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1.
mispronunciation of birthday, used by those who talk like they have a load of shit in their mouths
Yo yo yo, it mah birfday! Less go git some taco bre, hamburger meat, an some Slice!
by crash December 05, 2003
 
2.
An African American word for birthday.
Natasha gave birf to her 3rd child on her 17th birfday.
by Maxwell January 18, 2005
 
3.
The ghetto version of "birthday"
Why you sleepin wif so many hoes on my birfday?
by bbw965 June 02, 2010
 
4.
It is now used on the Internet and everywhere instead of the actual word 'Birthday'
I guess they say it cause it sounds better

birfday = birthday
-Happy Birfday bob :)

-Tomorrow is my Birfday
by Gorillafart June 15, 2009
 
5.
The way some uneducated black people pronouce the english word "birthday".
yo its mah birfday dawg u kno wat im sayin
by Freakasync April 12, 2005
 
6.
The best way ever to represent someone's date of birth.
Happy Birfday Kori!
by matballking March 30, 2011
 
7.
Slang for acknowledging a gift or good situation.
Person A says "Can I borrow five dollars?"

Person B hands them five dollars and says "birfday!"
by Rouseband January 04, 2014