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.
by jj87987 April 15, 2011
Get the hbdmug. by soJUNIOR July 22, 2006
Get the hbdmug. 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
( Person writes on his wall ... )
Person 1 : hbd
by KiiF January 9, 2011
Get the hbdmug. by Edis Leado October 31, 2004
Get the hbdmug. 
Has a big dick
by goovreau July 11, 2011
Get the hbdmug.