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Silver birthday

A birthday when the day of the week is same as the day you were born.
Silver birthday - for example,You were born in 31st July,on Friday and your birthday is on 31st July , Friday again!
by Miss malo June 28, 2025
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The Birthday Suite

A fabled spa/resort somewhere in the USA where, on your birthday, you get to relax for the whole day. You don’t wear any clothes from the time you enter to the time you leave, and you get to spend all day having sex with multiple partners and feasting on Little Debbie snack cakes.
Where the hell is Tim?

Oh, he’s over at the Birthday Suite. He’s turning 41 today.
by Big Buck Johnson July 23, 2025
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Birthday Boy

A derogatory term for a trans man that believes in transmisandry.
I can't believe Dylan really thinks trans men are less privileged then trans women... what a birthday boy!
by N. Grimalkin July 31, 2025
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Eighteenth Birthday

The age at which a girl is just old enough to have sex with an older man without him becoming a registered sex offender.
"Hey, its my eighteenth birthday! Now I can hook up with DILFS!"
by dilflover67 September 19, 2025
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Birthday paradox

In probability theory, Birthday paradox is the phenomenon concerning the probability that, in a set of n randomly chosen people, at least two will share the same birthday. The birthday paradox is the counterintuitive fact that only 23 people are needed for that probability to exceed 50%. The birthday paradox is a veridical paradox, i.e. a paradox that produces counter-intuitive results, but is demonstrated to be true nonetheless.
I always thought it was super rare for two people to share a birthday, but the birthday paradox says it only takes 23 people to make it likely!
by Emotional Cruiser September 26, 2025
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Birthday effect

Also known as the birthday blues, this effect is a statistical phenomenon where an individual's likelihood of death appears to increase on or close to their birthday, e.g. due to skydiving in order to celebrate birthday
They say there's a birthday effect, so I’m skipping the skydiving this year; I don’t want to become a statistic.
by Emotional Cruiser September 26, 2025
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Duplex Birthday

A birthday shared by two siblings who were born two years apart on the exact same day
Me and my sister have a duplex birthday. We are twins, but born two years apart
by Mrs birthday October 3, 2025
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