1. A song sung on someone's birthday.
2. The act of hitting someone with a container full of very hot tap water while they are sleeping or passed out; singing the happy birthday song.
My cousin was passed out on the couch so we filled up the dish basin with hot water and gave him a happy birthday, it was so funny!
by I'm Built for Speed! March 09, 2006
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When it's your 31st birthday, and you live on your own, with no wife, have a crappy job, no friends and no money, this is what you say to yourself in the mirror before bursting out into tears.
Happy birthday to me,
happy birthday to me,
happy birthday dear meeee,
happy birthday to... I suck! Waaaaaah!
by Me. October 10, 2004
I would define you the song,
but it's unfortunately copyrighted.
small, innocent child: happy birthday to you..

corporate: hey! bad child!
by Clark Buck January 22, 2008
Happy Birthday to anyone who's bored enough to look up happy birthday on their birthday...
Birthday girl: I'm so bored, I'm gonna look up happy birthday on urban dictionary.
by Ica May 29, 2013
9 months before this date, your parents decided to have unprotected sex
Happy birthday to you, happy birthday to you. happy sex day to your parents!
by skank-a-ma-phone February 28, 2011
happy-whatever reason im giving this small insignificant piece of crap to you.
Should be said with enthusiasm.
person, whilst handing someone else a half empty tube of toothpaste:Happy Birthday
by cheeseflambe July 20, 2009
The act of performing a celebratory ejaculation on to your partners chest , followed by a quick reversal to release a confetti filled fart on your partners now cum filled chest.
Man Billy surprised me with one hell of a Happy Birthday last night, I am still wiping confetti of my tits.
by Peeonus Virgins October 12, 2013
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