The resulting green poop of a delicious limited time only Shamrock Shake from McDonalds .
Wow my poop was so green today; must've been a Shamrock Shit.
by MichelleS March 1, 2008
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When you take a shit and it comes out green. Similar to the McDonald's shamrock shake.
Tom: Have you ever taken a shamrock shit?
Jenny: Only when I eat ham and cheese.
by sabianboy14 June 15, 2011
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What one replies to an Irish man or woman in response to something blatanly obvious
Irishmen "I'm a drunk"

Asian "No Shit Shamrock"
by vivic December 15, 2011
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The action of taking a shit while drinking a Mconald’s Shamrock Shake
Yo Man I just took a shamrock Shit
WTF! That better not he what i think it is!”
by HexTheCarbuncle February 24, 2019
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