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.
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!