when it is your birthday and a girl let's you have sex with her however you want.
i got a birthday from a girl at my party
when you roll one of your cousins in a carpet, cut a hole in it and fuck their ass while they cry.
"Stop it jimmy, I don't want to be the spider-man birthday cake this time"!
The year you experienced the song, album, band or event that defined you.
My soul's birthday is the summer of 1981 when I heard Van Halen's fourth studio album "Fair Warning"
When Bigfoot shows up to smoke weed with you on your Birthday
Why are you so high? I got the Oregon Birthday Special, broooooo.
How many times you have to beat the birthday boys meat determining how old they are. For example, Josh turned 24 years old today, so someone could beat his meat 24 times during that day.
Luke: “Yo Javier, did you see Josh turned 24 today?”
Javier: “Shit, imma give him a birthday meatdown”
The act of beating off your cock, whilst Marilyn Monroe's version of Happy Birthday plays aloud.
"Hey bro did you get in that Birthday Beatoff sesh?" "Yeah bro highly recommend middle to high volume on headphones."
A promiscuous woman
A woman that has been with a group of friends.
Dude, your girlfriend's not even a thot, she's a birthday cake...everyone has had a slice of that.