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1. A mistake;an error
2. A mistake you made while wanting a couple of flapjacks
KID: "I missed the winning shot in the basketball game! Oh floopjack."
MOM: "Hey son, you want to go home and have a flapjack?"
KID: "Thanks Mom. I wanted one depsperatley after I missed the shot."
Floopjack by Mister Robert December 28, 2005

flip like a flapjack

to change your ideas, views, attitude, to the limit, on a permanent basis.
Most politicians just flip like a flapjack, you never know who they'll be siding with tomorrow.

happy flapjack 

A sexual act in which the male pours syrup on the girls breasts and vagina. He then ejaculates into the syrup and pours oats onto the woman. She then begins to eat the mixture.
Wanna go baking? We can have a couple of happy flapjacks?
happy flapjack by Singing Richard November 4, 2014

Flapjack booty 

A debilitating disease where the suffer is endowed with a non-spherical, flat shape of booty. Named such due to the striking resemblance to a side-by-side pair of pancakes. Flapjack ass can be cured with regular visits to your local gym, where it's possible to perform enough squats to fashion a round, bouncy booty capable of correctly filling out a pair of jeans. Flapjack ass is most common amongst male members of the Caucasian race, but there is no solid scientific evidence to conclude it doesn't affect the other races as well. Occasionally present in females, but is much more common in males. When flapjack ass is discovered on a woman, it's often so rare that your local newspaper may give a cash prize to the lucky photographer who can capture one on camera.
"Lo, look at that face! Alas, it seems he suffers from Flapjack booty! He does not appear to be a suitable mate. How unfortunate."
Flapjack booty by jkejke February 9, 2014

Flapjack Titties 

When a bitch has those weird titties that flop around and sag down with that weird fold. Them chimpanzee titties.
Damn you see that nasty bitch over there with them flapjack titties? GROSS!!!
Flapjack Titties by _viper_ May 13, 2014

Panhandle Flapjack 

The sexual maneuver whereby, whilst penetrating a female anus from a rear-entry position ("doggystyle"), the female utilizes the slack skin of the male's scrotum to stimulate the vulva and clitoris in an act of manual masturbation.
I was stuffin' my girl's dumper like a thanksgiving turkey when all the sudden she grabbed my coinpurse and gave herself a panhandle flapjack.
More from Urban Dictionary
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

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
Literally "dirty" pronounced with a West Indian accent. Can also have a positive connotation, for example Sean Paul's album title "Dutty Rock".
"The girl is pretty but she corrupt and dutty!"

or, in a positive usage:

"Booya! That freestyle was dutty!"
Dutty by J Hall April 3, 2003
Word of the Day on October 1, 2026
korean word for madam, older woman
Ajumma wait a moment
Ajumma by aintnotinbutnice July 5, 2009
Word of the Day on September 30, 2026

Slop Grenade

When someone uses AI to generate a large document, slide deck, or piece of code/software and tosses it over the fence for you to deal with.
Chad: Hey Brent I sent you the new backend API change to review, it’s only 100 files changed.

Brent: he just tossed me a slop grenade
Slop Grenade by Joe Squid September 28, 2026
Word of the Day on September 29, 2026
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