Someone who has the same birthday as you. It is refered to as a shared birthday. Some may refer to it as a mutual birthday. Facebook is notorious for displaying all your friends' birthdays on your homepage to see common birthdays. When the time for the birthday comes, one friend says happy birthday to another and the other friend replies the same way. It is a known fact that people enjoy discussing common birthdays.
Guy 1: Dude, did you know Jay Leno is a birthday buddy with Jessica Alba?
Guy 2: Yea, I saw it on The Tonight Show last night.
Guy 1: Yea, they're both on April 28th.
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The mass number of facebook wall posts that one receives on his/her birthday, especially from people that the recipient never talks to.
Guy 1: Dude, I've been getting wall posts all day, I don't even know half the people writing on my wall.
Guy 2: I know, the birthday barrage can get pretty annoying sometimes.
Someone who's birthday is the day before or after yours
Person 1: happy birthday! I guess that means we're birthday neighbors.
Person 2: really? Was your birthday yesterday or is it tomorrow?
Person 1: my birthdays tomorrow.
Person 2: well happy early birthday, birthday neighbor.
An excuse used when you want to sit at home and do nothing rather than go out or follow plans someone has made.
I can't go tonight, it's Ray's Birthday, sorry.
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from midnight to midnight on the day of your birthday, you can say and do whatever you want without consequences.
joe: hey sally I want to fuck you
sally: what the hell?
joe: BIRTHDAY IMMUNITY!
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A mental state indicating a period of intense revelry and hardcore drinking on the part of one or several people.
Jonno: “I’ma go into Birthday Mode this Saturday”
Blizzle: “Oh man, is this gonna end with neon-colored vomit all over your room…again??
Jonno: “Dude, that was Neil’s last Birthday Mode”
One's 35th Birthday. At 35 years of age one meets the minimum age requirement to be president of the United States. This qualifies the 35th Birthday as a milestone and permits one to turn it up a notch and get buckwild, while maintaining a sense of regality.
It's your Presidential Birthday Dan. You're 35 now so, put your pants back on, stop acting so jackassy and finish those tequila shots..Mr President.