Birthday-shift 

Verb- The practice of celebrating one’s birthday on a different day because that person’s actual birthday is not convenient for the party thrower(s).

John: Dude… Jane is going to be so pissed off when we celebrate her birthday on Friday instead of her real birthday date on Wednesday. Missy isn’t going to be here on Wednesday so she forced us to pull a Birthday-shift.

Birthday-shift by Zeke489 May 6, 2009

Birthday-Shift 

The need to reorganize a birthday celebration for someone who is too busy working or out of town on his or her birthday.

"Crap I'm going to be out of town on my birthday. I hope Sandra isn't going to mind pulling a birthday-shift for me."

"Don't worry, Chris, she's knows, she's hiding a present in the glove box of your car and she's got your real birthday planned for another day."

Birthday-Shift by birthday_administrator April 26, 2010

Birthday Shaft 

When you are not invited to a birthday party because you are lame.

Did Nick get invited to that hot girl's birthday party?

Nah, he took her on a lame date so she gave him the Birthday Shaft!

Birthday Shaft by randy2.0 October 23, 2009

Birthday Shaft 

When the only present you give the birthday girl is your birthday dick. Happy Birthday.

Girl, you're about to get birthday shaft for a present.

Birthday Shaft by Totally not Bill July 24, 2016