1 definition by Yourfriendlyneighbordowntheboc
back to the past day begins on December 21, this where all the users on many social media change their profile picture and username back when they joined that social media platform you can change back your username and profile picture when it hits December 22.
yomother32: hey it's 21 December you know what that means.
slayer32: well its "back to the past day"
ronnyjohns: you got it
slayer32: well its "back to the past day"
ronnyjohns: you got it
by Yourfriendlyneighbordowntheboc December 19, 2021