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All Dayer 

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.
All Dayer by jake29 June 2, 2011

All dayer 

A marathon drinking session which starts around lunch-time and carries on until dawn. Typically involves barbecues and beer gardens in Summer and warm pubs and Christmas jumpers in winter.
All dayer down the pub, stumble into town and see what happens
All dayer by LashCommander May 2, 2011

all dayer 

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.
all dayer by Rico Beast March 13, 2009

All-Dayer 

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.
All-Dayer by teboe17 June 6, 2013

all-dayer 

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."
all-dayer by Spurts N. Squirts March 31, 2010

all-dayer 

V. The opposite of an all-nighter. An all-dayer occurs when a person has odd sleeping patterns. These habits result in a person going to bed anytime during the day. An all-dayer is the act of staying awake during the day instead of going to sleep. This act is usually performed in order to maintain a regular sleep schedule.
Mike: I'm going to sleep.

Jacob: Dude, WTF it's two in the afternoon.

Mike: I know. It's just that after that all-nighter I pulled for the calculus exam my sleep schedule has been off.

Jacob: Well, i've got tickets to the basketball game at five, and I thought you were going to go with me.

Mike: Oh snap, I totally forgot about that. I'll just pull an all-dayer so that I can go to the game.
all-dayer by WundyBear December 28, 2009
More from Urban Dictionary

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026
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