Facebirth
A person who thinks your birthday is on a different day because they got a Facebook notification and they're too dumb to check if it was a joke.
My friend said my birthday was on Monday because Facebook told her. I was like, 'You changed my birthday to Monday as a joke!' She was like, 'I didn't change your birthday!' I was like, 'You did! You changed it to Monday as a joke!'
My coworker said my birthday was on Friday because Facebook told him. I was like, 'You changed my birthday to Friday as a joke!' He was like, 'I didn't change your birthday!' I was like, 'You did!'
My mom said my birthday was on Saturday because Facebook told her. I was like, 'You changed my birthday to Saturday as a joke!' She was like, 'I didn't change your birthday!' I was like, 'You did! You changed it to Saturday as a joke!'