When a person leaves a place, usually a party or social gathering, without giving proper goodbyes to the people he was with. Usually due to a high level of intoxication.
Does anyone know where Spencer is?
He said he was going to the bathroom, but I think he totally just shamrocked us!
by Nickle Bags February 4, 2009
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Urinating on a sexual partner during intercourse after ingesting large amounts of asparagus
Yo! I gave that bitch a shamrock shower like a muther fucker!
by opeake March 27, 2011
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After the viral video of the same name where a racehorse bolts off with an inexperienced rider on board: A feeling of being totally out of control in a dangerous situation where the only certain outcome is that it's not going to end well.
Halfway round the roller coaster ride I freaked out and was like "Woah Shamrock!"
by ChesterChes May 13, 2017
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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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The best possible item ever placed on the Mcdonalds' menu. People wait hours just to buy one when they start selling them the month before St Patrick's day. A green vanilla mike shake (which may or may not be more addictive than crack.)
Person X: What the hell is this line for at McDonalds?
Person Y: They released Shamrock Shakes, again!
Person X: Is that a Mexican thing?
Person Y: Irish.
Person X: Ahhhh...bless the Irish and their dairy treats!
by Philly1221 September 20, 2006
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Fictitious mask company in the third instalment in the Hallowe'en franchise, "Season of the Witch" (the one without Mr. Myers). The masks are the colours of the Irish national flag (orange Jack-O-Lantern, white skull, green witch), and are made by a company in a weird all-Oirish town on the coast of California. On activation by a signal on the big night, the masks transform their (numerous) wearers' heads into so many divers creepy-crawlies. The Silver Shamrock company wins the booby prize for the most irritating television jingle ever inflicted on the world in fact or fiction; a countdown to the tune of "London Bridge is Falling Down", starting "(x) days to Hallowe'en, Hallowe'en, Hallowe'en". I had it in my head for WEEKS. The head of the company is played by an actor from Wexford, Ireland, and incidentally as far as I can tell is the only figure in the history of American horror films to pronounce Samhain correctly.
Four days left to Hallowe'en,
Hallowe'en, Hallowe'en,
Four more days to Hallowe'en,
Silver Shamrock!
by Fearman February 10, 2008
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The term used to define the diarrhea after eating McDonald's.
Person 1:Dude you wanna go to McDonald's before we go to the party?
Person 2:I dunno man, i dont wanna get the shamrock shakes at the party.
by Alund0 January 17, 2010
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