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all day er day 

"Er" is short for every; a phrase that means an action is occurring all day, every day
Tim: Yo, Mac! You been smoking that herb?
Mac: You know. All day er day!
all day er day by Tim Elephant August 25, 2008

Steak & knob er day 

This is the opposite of Valentine's day. During this period of time, any male is entitled to complimentary fallatio, penis cleaning, and a charred piece of cow flesh.
Dude! Did you celebrate Steak & Knober day? My knober was off the hook!!
Steak & knob er day by hits December 7, 2003

national stian er styg day 

Day of'er 

Someone who wears the t-shirt/apparel of an event on the day of the event, hence "day of". The person wearing the t-shirt is likely a novice at whatever event is occurring, hence their proclivity to wear their newly acquired gear.
Examples include: some sporting event or race, regattas, marathons, any large group event.
1: Ha look at that kid wearing the t-shirt that registration was handing out
2: I know, such a day of'er
Day of'er by Andyslaybids May 16, 2019
erday im hustlin
erday by Kostco April 5, 2009
E'erday by Mtothew March 13, 2010