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1.
HBD
An acronym that stands for human biodiversity. It is the acknowledgement and study of how humans differ from each other on both the individual and group levels because of differences in genotype. Differences include, but are not limited to, personality traits, athletic ability, intelligence, height, health, and physical appearance.
"What are some things that HBD informs us on?"

"Why professional sports leagues like the NBA and NFL are dominated by people of West African descent, why blacks and Hispanics consistently perform more poorly on all forms of cognitive testing than whites and Asians do, and why the Amerindian immigrants mowing lawns in the suburbs are so much shorter than the residents of those suburbs, just to name a few."
by Audacious Epigone October 12, 2011
 
2.
hbd
A lazy way of saying, "Happy Birthday!"
X: It's my birthday today!!
Y: hbd
X: fuck you lazy bitch
by soJUNIOR July 21, 2006
 
3.
HBD
a shortcut version of Happy Birthday. usually used when you cannot write it or do not have enough space to fully write the whole thing due to the limited characters usage allowed

how the heck do we fit happy birthday on this small ass card?
just HBD it.
by Tonicxboom September 10, 2008
 
4.
hbd
Means: Happy Birthday
Birthday Boi: HEY! It's my birthday!
You: HBD!
by Edis Leado October 31, 2004
 
5.
hbd
The way you wish someone a happy birthday on facebook if you don't like them, sometimes in hopes to stir up a fb fight.
Oh i hate that bitch, i'm just gonna write on her wall HBD
by jj87987 March 27, 2011
 
6.
hbd
When you have a friend on Facebook or something that you don't really know that well, and it's his/her birthday, you say "hbd" instead of saying "Happy Birthday!"
Person 1 : Hey, at the side of my Facebook it says its John's Birthday. I don't even talk to him, but he goes to my school. But I'll just say happy birthday anyway.

( Person writes on his wall ... )

Person 1 : hbd
by KiiF January 04, 2011
 
7.
HBD
1.

The incorrectly acronymized "Happy Birthday"; as opposed to the correct acronyization: HBd.

2.
The acronym of “Has Been Drinking”, used predominantly within emergency medical services in the area surrounding Toronto, Ontario. This term is exclusively used grammatically as if it were an adjective; a euphemism for drunk.
1.
"Today is Decmember 25, HBd Jesus"

2.
“Patient is a 22-year-old male, who is HBD.”

“Patient is Female, 17-years-of-age, very HBD.”

“My HBD patient is combative.”
by Otttawa November 27, 2010