Mayonnaise n' Mustard 

Simple as dat. Formally used by bay area rapper "Pill Clinton", a.k.a. Mac Dre. To explain a complex situation with a short connotation, such as "thats that".

We hopped over there, mayonnaise n' mustard, yyyyaaaaaddddaaaammmeeaaannnnn??

Mayonnaise n' Mustard by Jah Light, Bob. December 18, 2008

mustard and mayonnaise

Yay slang popularized by the one and only Forty Water aka E40, a name that refers to the yellow and white stripe on the sidewall of Vogue tires.

Got that 68' coug, on mustard and mayonnaise wit triple gold hunit spokes.

mustard and mayonnaise by bigg hood May 27, 2006

Mustard and Mayonnaise

Vogue Cadillac wheels. They come on older Cadillacs. Called Mustard and Mayonnaise for the white and yellow walls on the wheels. Just another word from bay area rapper E-40.

Damn, that Cadi is sitting Mustard and Mayonnaise DooDoos!

Mustard and Mayonnaise by Ernesto Salazar May 1, 2008

mustard and mayonnaise

n. 1) in specific reference to the yellow and white lines on any road.

2) non specific reference to the left/right boundary.

"Keep it between the mustard and mayonnaise!"

mustard and mayonnaise by Col. Dante Knucklebuckle November 19, 2009