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An Asian who thinks they're black on the inside. An alternative to a Chigga.
That dude is a yellow m&m thinking he's black and all.
by syd_giz July 18, 2005
Someone who is slow, plump, and unattractive. A nicer way of saying "retarded." The yellow m&m character is the dumbest of all the m&m characters.
"Catie, you are way too classy to be making out with that yellow m&m!"
by seafoamsam September 24, 2011