sex mustard 

the musty smell of a room after hours of sex.

The smell of sex mustard lingered in the room.

sex mustard by meleah June 7, 2004

but mustard 

a wet fart, or a drippy fart, or a nasty squirting fart,any fart that leaks more than air...

someone farts and it leaves a litlle residue BUT MUSTARD when you fart and have to wipe yourself or think you have to check your underwear you spit but mustard

but mustard by hassan.j March 4, 2008

Pocketful of Mustard

UK slang: "I've got nothing." or "Nothing came of it."
I think it comes from something like 'couldn't even get a drink at the pub, just left with some stolen mustard pacs'.

Did you get the (job/girl/money/news)?... Nah; "pocketful of mustard."

Pocketful of Mustard by RichieRichie December 10, 2008

Mouse in the Mustard 

A final expression of disgust at severely inappropriate behavior

Casey, you've really put the mouse in the mustard this time.

Mouse in the Mustard by MustardMouseStudios April 12, 2009

keen as cheese and mustard 

To be excited and/or show agreement towards participation in an upcoming event

All over gang member 1: "Halo?"
All over gang members 2+3: "Halo!"
All over gang member 4: "I'm as keen as cheese and mustard to play Halo"
All over gang member 1: "Then let's play"

keen as cheese and mustard by Captain Rough Around The Edges October 25, 2006

tiddy mustard 

The underboob sweat of a females breast.

Yo, the tiddy mustard on that girl stank. Her tiddy was soaked in it.

tiddy mustard by Blanket bandit April 9, 2017

Butt Mustard

The greasy residue left in your underwear.

Butt Mustard by Stuart Cox May 31, 2003