When you become a massive dickhead to everyone, especially your sibling, just because you were pushed out of a vagina on this day.
by QueenOfRain May 19, 2018

The ability to say whatever you want, no matter how stupid it may sound, and not be reprimanded because it is your birthday.
*at Jeff's birthday party*
Jeff (has birthday invincibility): Fall Out Boy's version of Beat It is much better than Michael Jackson's.
Everyone one: *nods head in agreement*
Jeff (has birthday invincibility): Fall Out Boy's version of Beat It is much better than Michael Jackson's.
Everyone one: *nods head in agreement*
by cashruleseverythingaroundme September 23, 2012

the act of displaying a close friendship between two friends by getting as undressed as you both feel comfortable and either hugging, snuggling, or any display of affection you feel apropriate. pushing the limits is encouraged.
john and sally get in there underware and hug to show there love & friendship for each other. they are officially birthday suiting
by master69man August 24, 2011

by Venabob56 January 4, 2018

When you receive a Facebook message telling you of your "friends" birthdays and you suddenly realize you neither know or like these people so you "unfriend" them.
"Dude, I got a Facebook message today telling me about 27 peoples birthdays coming up this month who I fucking hate. So, I did some Birthday Cleaning. Happy birthday dicks!
by MattMat757 March 1, 2011

Double it up!!!!
by Nikki.Ledbetter October 14, 2016

by Satansblodsoffer June 21, 2023
