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6.
The feeling one gets after pulling an all-nighter. You start to feel so tired that you aren't even tired anymore. You eventually start to feel like you are in a dream. Sometimes when under the influence of an all-dayer people might start talking to complete strangers and be completely unaware of what is going on around them. You might also feel a strange sense of happiness and confidence.
All-dayers can be fun and scary at the same time.
by teboe17 June 06, 2013
 
1.
After an all-nighter, you have a new challenge: an all-dayer. It's when you stay up all day after staying up all night. Harder than it sounds.
"Hey man, I'm so FUCKING tired. Just pulled an

all-dayer."

"Woah, seriously!? That deserves something."

"I would like that "something" to come in the form of either a bed or a caffeinated beverage."
by Spurts N. Squirts March 31, 2010
 
2.
A play on the phrase all nighter; used to describe the almost impossible feat of staying up all day without napping.
dude #1: Hey bro wanna take a disco nap?

dude #2: Naw dude, I need to get some stuff done. I'm going to have to pull an all dayer.
by erieee May 21, 2010
 
3.
Staying awake all day to try and reset your body clock.

Normally follows after a sequence of going to sleep at increasingly later times, until your going to sleep around dinner. The only cure is to hack it through the day and go to sleep at a sensible time.
Need to go to sleep at a sensible time, gonna do an all dayer.
by jake29 May 08, 2011
 
4.
instead of an all nighter, where as most people fall asleep as soon as morning comes around, an all dayer extends it another 24 hours. This makes it a 48 hour awake period.
Nah man I'm not going to sleep; I gotta pull an all dayer.
by Rico Beast November 02, 2008
 
5.
Too pull an all-dayer; Coming home from school and playing video games all day, until your bedtime at 9 o' clock.
Person 2: Hey, Nischant! I heard you played an all-dayer yesterday!
Person 2: Yeah, man. I played right after school until night time. It was dopesauce!
by yakerrrrr February 24, 2011
 
7.
The act of sleeping all day after an all-nighter, a large party, or a long gaming session.
Dude, Hannah is pulling an all-dayer because she stayed up so long.
by DaFatMan August 04, 2010