the day that you actually celebrate your birthday. it may acutally be on anniversary of your birht or it could be two weeks later. it doesn't matter.
person one: hey what are we doing for your birthday?
person two: nothing i have work that day but we are going to six flags on my birthday day
person one: awesome i am so there
by ZarahMarieS April 21, 2008
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When you and your friend's birthday's are five days apart. It is the day that is right in between.
Happy inbetween birthday day!!!!
by Mar W. January 30, 2009
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When ones birthday falls on a weekend it is a great time. However, it is much less fun when one's birthday is on a weekday. As a consolation, many people observe the tradition of birthday 9 days. Instead of one big party, you can celebrate your birthday in smaller parties starting the weekend before your birthday and ending at the end of the following weekend, making a total of 9 days.

There are two sects of people that define which days are weekend days. One group defines the weekend as Friday and Saturday, while another group defines the weekend as Saturday and Sunday. Usually people over the age of 30 fall into the latter group, since they are too old to go out and party on Friday night.
Mark: "Does birthday 9 days start this weekend?"
Derek: "Hell yea! 9 day bender here I come!"
by DerekfromMadison February 16, 2017
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The day after your birthday is birthday Boxing Day
Spent my whole birthday Boxing Day hanging out my arse
by Woodpile October 11, 2022
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Rule that only applies to your closest bestest friends and gives them the power to bestow their birthday wishes not on your big day but within 4 days of you being born.
E.g. Hey Kate, couldn't wish you on your day but am calling now - I invoke the 4 day birthday rule.
by Burnerme December 1, 2018
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March 17 is jeff weis birthdya Say happy birthday jeff weiss on march 17 it’s national day!’
wow i sure do love jeff weiss!
me too, i’m so happy it’s national happy birthday jeff weiss day!
by Jeffweiss March 17, 2021
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A tradition as old as time where anyone witha boyfriend tells him what his presents are four days before his birthday to keep the Boogeyman from coming in their house and fisting them.
"Today's Tell your boyfriend what his presents are four days before his birthday day!"
by Toad-Bit October 28, 2023
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