Top Definition
A drink only found at McDonald's from a special request: Half Shamrock Shake and Half Chocolate. Very tasty. Originated in Wisconsin.
Person 1: Hey, where do you want to eat tonight?

Person 2: Let's hit up McDonald's and get some Dirty Shams.
#mcdonalds #food #drink #chocolate #shamrock shake
by DasWxMan April 17, 2013
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