The Hen's Mustard 

Used colloquially to mean an unnecessary addition of something 'Exciting' to what is already considered a functioning - if boring activity/object/product

"I used to quite like Dave's car, but that spoiler really is the Hen's Mustard"

The Hen's Mustard by navarrone906 March 14, 2017

Mustard Shot Positive 

When someone is so sure of their answer, they are willing to drink a shot glass full of mustard if they are incorrect. Usually used to overrule a friend or teammate's answer to a trivia question.

Roscoe was Mustard Shot Positive that the answer to the trivia question was "November Rain". He ended up drinking 1.5 ounces of dijon.

Mustard Shot Positive by MKLynch June 5, 2011

mustard shit 

a shit with the color and texture of Dijon mustard

"Wow that really burns. Must of been a mustard shit"

mustard shit by dibber88 November 29, 2009

mustard sandwich 

When there's no food left in the fridge, you're in-between paychecks, and you've got to eat something. A staple of the poverty-stricken masses of America

I spent the last of my paycheck getting food for the kids, so now I'm eating mustard sandwiches.

mustard sandwich by my name is not billy January 9, 2019

mustard stamp 

the act of placing ones unwiped asshole on an unsuspecting persons forehead, the placee then grips the ears of the stampee forcing the forehead in a violently upwards motion resulting in a distinct seal of approval shitstain on the forehead; this move is typically performed whilst giving her the arabian goggles; the nature of ones feces must be such that the hue is mustard yellow in color and should be performed after ingesting large amounts of cole slaw, dill relish, saurkraut and copious amounts of Old Milwaukee.

Your mom most definitely did not appreciate the mustard stamp that I gave her last week....yet, I find humor in the fact that she has yet to clean it off???

mustard stamp by cornfritter October 26, 2010

Ken Griffey, Jr. Mustard Surprise 

Prior preparation is required. The male must buy a bottle of mustard and hire Ken Griffey Jr. giving him specific directions. Then, while the male is having sex (doggystyle), when he ejaculates in his partner, he gives the signal to Ken Griffey, Jr. who is presumably hidden in the closet. Ken Griffey, Jr. then bursts from the closet spraying mustard in the eye of the male's partner. Having Ken Griffey, Jr. announce himself at the same time is optional.

Dude, I can't go out this weekend. I totally gave my girl the ol' Ken Griffey, Jr. mustard surprise last night, so I have no money after hiring Ken Griffey, Jr.

Ken Griffey, Jr. Mustard Surprise by Leemanmasteroftheuniverse August 20, 2009

reverse mustard slide 

Anal sex, when yellow mustard is used as the lubricant.

Sex getting boring, try a reverse mustard slide to spice things up.

reverse mustard slide by derksoda December 7, 2009