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A contraction. Created from the phrase, "Man, fuck....," where "fuck" is replaced with the "eff" sound when swearing is not appropriate. Pronounced "Maneff."
"This movie sucks. Manf this, I'm going home."

"Hey, Rhonda said you are stupid."
"Yea? Manf that bitch!"
manf by Dethbed666 February 4, 2012
Related Words

Manfluencer 

The one and only Bryce Horton. The mini sauna loving husband/dad that can rock new balances like no other. You may find him laughing uncomfortably due to his hilarious wife. Maybe putting this on the website will get him officially verified? Only time will tell.
“I forgot to tell you i saw the manfluencer at target!”
“Oh Bryce? I saw him the other day driving down the street with a blue check mark on his car”
Manfluencer by Cassidy gill August 5, 2021

manfangled 

When you are sleeping in bed and the blanket is in disarray or all bunched up on the bed.
Last night in bed I could not get comfortable because the blanket was all manfangled.
manfangled by Richard K. December 9, 2008

manfluencer 

Bryce Horton is a total manfluencer
manfluencer by Cbell918 January 16, 2021
When someone "banff"s a dude. To banff is to punch someone in the lady junk. To manff is to punch someone in the man junk.
Phil: "I will banff you if you say that one more time."
Curtis: "No, dude, you will manff me."
Manff by TheTrenchWench December 28, 2010
MANFAST (all caps) is an annual competitive event that takes place in SE Michigan in mid-July.

Competitors participate in various MANLY feats to assert their male dominance by lifting up trees, crashing into each other at full speed and determining who can eat a pound of bacon the quickest.

The winner of the contest is determines by the top three contestants from the previous year and is awarded with a gift and a breakfast including (though not limited to) bacon, sausage, bacon and bacon.

It is not mandatory that you be a male to compete. Several women have entered the competition and some of those women have cracked the top three.

It is also not uncommon for participants to attend dressed as something manly (Chuck Norris, Danny Trejo, Black Dynamite, The Bearjew, etc...)

In the end, MANFAST is the greatest way to assert your dominance over the herd.
I plan on attending MANFAST this year. Bring the bacon and beer...we have work to do.
MANFAST by Slogo November 9, 2012
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

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
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