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1. 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.
2. 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!"
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