Top Definition
A 5-15 year old car that isn't quite shitty enough to be called a shitbox, and isn't economical enough to be a ecobox.
"Greg bought himself a mustard box, he fell in love with that thing. It's a 2004 VW Passat"
#musterd box #shitbox #ecobox #average #gay
by Arionio March 06, 2013
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