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Masterchief 

The most badass character in the Halo series.
"We've all run the simulations, they're tough, but they ain't invincible. Stay with the Masterchief, he'll know what to do.
Masterchief by Arori4 August 24, 2010

Mankerchief 

The male version of the pashmina, hijab, or loop scarf worn by metrosexual men who have no shits to give today.
pashmina mankerchief metrosexual
Mankerchief by Clancy100 March 4, 2015

Master Chief Syndrome 

An often overused antic in modern culture where one man (or small group) face incredibly overwhelming odds and win. Generally only met with "dude" and "sick" from bro's and frat boys, and met with chargin from people with brains.
"Dude Master Chief just jumped out of a space ship and blew up that other ship. Then he single handedly killed 4.5 million aliens with his bare hands... sick."

"That end fight in Saving Private Ryan was such an obvious case of Master Chief Syndrome I'm suprised anyone can keep a straight face."
Master Chief Syndrome by Jackel_623 February 1, 2010

Navy SEAL master chief

the most badass mother fucker on the earth. capable of killing an entire army of terrorist assholes just with his thoughts of how he would kill them.
: Did you hear about that Navy SEAL master chief?

: No, what happened?

: Al Qaeda died for him because he needed a holiday.

Master Chief 

A bad-ass soldier from the video game "Halo: Combat Evolved". Usually seen in green MJOLNIR Mark-V Armor. Synonymous with 1337.
The Master Chief can run at up to 55 kilometers per hour. He is the embodiment of 1337ness.
Master Chief by Araquiel May 28, 2004

Mastercheese 

To run over/hit a member of the opposite sex with an automobile in hopes of gaining attention, and possibly a date from them.
"I totally MasterCheesed today when I backed up over Allison before asking her to the Prom"
Mastercheese by strife777 December 8, 2005
More from Urban Dictionary

square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
square grouper by slipsheet November 6, 2004
Word of the Day on October 7, 2026
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

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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