1) A gathering/celebration of why our not special or no one cares 2) Everyone/everything has a date of creation, hence the birth day. 3) Just another bullshit holiday for the already barely-getting-by-on-my-shitty-pay-month-to-month pay checks so to become pressured to celebrate the many and continue to make those in power richer (why they sleep) and you go back home to your programmed existence.
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.
This is just a simple phrase you use in sticky situations, or when you're simply fed up with the person you are currently talking to so that the person is then confused.
When a guy is fingering a girl's asshole and he puts that finger in his mouth and gags himself until he throws up onto her asshole and then the girl lets out a fart, making a barf bubble, and after it pops, it shows the location of her asshole and then the guy fucks her asshole. HAPPY BIRTHDAY!
"Hey did you hear?"
"Hear what?"
"Oh my god man... Steve was dared by his girlfriend to give her The Happy Birthday on her birthday!"
"Ew man, that's fucking gross."
"Yea but I heard it's like getting high."
"What ever man, that's fucked up!"