birthday suit 

one's bare skin (from the fact that a person would not have any clothes on the minute they were born)

I found it embarrassing for them to see me in my birthday suit.

birthday suit by Light Joker August 3, 2005

Birthday Brothers 

Two people that were born on the same day. They do not have to be blood relatives.

Paul and Scott were both born on June 30, therefore they are birthday brothers.

Birthday Brothers by stupidass5000 June 29, 2008

Birthday Minute 

When the time of day matches the month and day of your birth. Usually when the time is shown on television.

Look, it's my birthday minute.

Birthday Minute by toypit June 16, 2016

Birthday suit 

Basically naked , the way one is born , defined by renowned spokesmen M o h a k C

I feel really comfortable roaming around home in my birthday Suit.

Birthday suit by fragger123 December 7, 2017

birthday tool 

A person who feels the need to make sure absolutely everyone knows it's THEIR birthday. These people will constantly remind everyone they make eye contact with, and count down through their facebook statuses several days in advance. Even though everyone has a birthday, they feel that theirs is somehow equivalent to a national holiday.

Birthday tools can easily be spotted by dramatic ensembles, including fluffy tiaras, an excessive amount of balloons, cakes, etc.

Birthday tool: ZOMG MY BIRTHDAY IS IN 6 DAYS!!!!1!!!1!
Normal Person: ...Cool.

on actual date of birthday:
Birthday tool: GUESS WHAT YOU GUYS?! TODAY'S MY BIRTHDAY!!!!!
Normal person: Too bad you announced that 8 times already.

birthday tool by i.have.no.name. November 4, 2009

Birthday Caird Pish 

Scottish response to someone being soppy/sentimental to remind them that showing heartfelt emotion isn't allowed.

Victor: *talking to his dead wife at her grave*

Jack: You're a creepy bastard. Talking to Betty as if she's still here.

Victor: She is still here! In ma heart!

Jack: Birthday caird pish!

Birthday Caird Pish by Craiglang May 9, 2022

Birthday Bukkake 

A celebratory bukkake in which the recipient is cum on, on their birthday, by the amount of men corresponding to their new found age.

Emma's 22nd Birthday party was mental! That Birthday Bukkake has put me right off having a birthday party of my own"; "I dread to think of the Birthday Bukkake that will take place at my nan's 90th Birthday party, It is going to be tricky to find that amount of men willing

Birthday Bukkake by Rodent Features April 22, 2011