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Term used to describe people who slur their "th" resulting in a "f" sound. Usually people of asian descent. Rappers are known to do it as well, although they are not catagorized as such.
Birthday = Birffday
Bathroom = Baffroom
Both = Bof
birff by A. Ortiz October 30, 2005
Related Words
Crazy people who think Barack Obama was not born in Hawaii, USA. They Claim his Birth Certificate (COLB) is a fake, he was born in Kenya, making him ineligible to be President.
Groups that fall under Birfers: PUMA, Fringe Right-wing Blogs, Conspiracy people, Bigots, Sore Losers and mentally unstable.
Birfers by Krownick January 28, 2009
A nutjob conspiracy theorist who believes President Barack Obama was not born in the United States.
Dude 1: "The birfers are so desperate to prove that Obama wasn't born American that they resort to forging birth certificates."

Dude 2: "Yeah. Birfers are non-stop comedy."
birfer by Darth Chaos August 12, 2009
Why you sleepin wif so many hoes on my birfday?
Birfday by bbw965 June 2, 2010
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!
birfday by crash December 5, 2003

birf control 

Preventing pregnancy by choosing to engage in anal intercourse.
She's paranoid about making babies so we had to use birf control.
birf control by Drunky McKrunky September 21, 2008