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Spark-plug 

A woman who sleeps with only inside and outside wiremen, union electricians, despite their marital status. Much like a badge bunny, candy stripper, lot lizard.
Yea, Melenie Zavala is quite the spark-plug. Saw her coming out of the JATC’s motor home the morning of the picnic and heard she fucked the Union President a while back. She really likes to keep it in the family. That spark-plug knows how to jump a cable.
Spark-plug by Fistfull of lighting October 8, 2022

Spark Plug 

A Spark Plug is a device that ignites the Air-Fuel mixture in an engine chamber causing combustion and piston movement
Arvin: my car had trouble starting so I changed the Spark Plug
Matt: did it fix it?
Arvin: yeah, now it runs and starts smoothly
Spark Plug by Wooferine January 25, 2021

spark plug 

Another name for a man's testes.
I was hoping to get lucky today, but my spark plugs are misfiring.
spark plug by jammyman December 31, 2009

spark plug 

(verb) when a sparky dances up on you, bends you over, and grinds your brains out
I was spark plugged last night and kind of liked it.
spark plug by Mista Mistaaa May 29, 2010

Spark plug 

When you insert a rod of tinfoil in your urethra, and proceed to insert your erect penis in a microwave.
Dude, after I lost that bet with Cassie she made me do a spark plug. I accidently set an African orphanage on fire.
Spark plug by sdascoli October 19, 2017

spark plug 

Another term for a tampon. Also may be refered to as a "plug."
"Honey, I gotta go buy some spark plugs...."
(Before sex...)"Honey, let me take out my plug first! "
spark plug by Crickett6969 June 15, 2008
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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