tweener day
(noun) the day between two people's birthdays, the perfect day for them to throw a conjoined party
"yo are you going to tweener day?"
"duh but it its a weird idea since erin and jordan are both so obsessed with themselves I cant believe they are throwing a conjoined party"
"duh but it its a weird idea since erin and jordan are both so obsessed with themselves I cant believe they are throwing a conjoined party"