A green leaf with heart shaped petels. they can vary in number but you are most likly to find them with three leaves (four if you're lucky)
Jimmy never found a four-leaf shamrock and now he's dead....
by cailin beag August 31, 2003
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(1) To screw someone over; scam.

(2) To inflict severe injury upon someone as leverage to facilitate the extortion of money.

"Shamrock" is most frequently encountered in the passive, as in, "you have been shamrocked." (Origin: Shamrock Towing, a notoriously unethical business in the greater Columbus, Ohio area, ca. 1957)
(1) After paying $115 for the predatory towing of his car, Willis figured out he'd been shamrocked and called an attorney.

(2) "You didn't pay Vinnie your protection this month?! Buddy, you are sooo shamrocked!"
by Carl Willis April 28, 2004
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(verb) slang, to hit somebody hard in the head or face.
That kid got shamrocked by Carl the other day.
by Cizzle Mayne January 19, 2008
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Adj. Fucked; hosed; screwed. To have been dealt a low blow by someone. To be "shamrocked" is to be in very dire circumstances indeed, cf. shamrock.

(Origin: Shamrock Towing, a highly unethical company operating in the vicinity of Columbus, Ohio)
Dave talked trash to the wrong folks, and now his ass is shamrocked.

If you haven't dropped Differential Equations by the May 1 deadline, and you've flunked all the exams...all I can say is, "you're shamrocked, big fella!"

Twamley was feeling mighty shamrocked after he had to pay the towing company $45 for an illegal half-drop.
by Carl Willis April 28, 2004
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when one puts on a veteranary cone, shakes up a beer (preferably a yeungling) then proceeds to spray the said beer toward ones face and drink as much if the incoming beer as possible.
after jimmy was done shamrocking the beer justone gave him a hot carlson.
by steven douglas December 25, 2005
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The double handed action of your local bar tender as they top off your Guiness with said 'Shamrock' motif.

'To Shamrock' ; verb. To ladel your lover in an artistic fashion with your 'man muck'.

Post 'Shamrock' a wet wipe (or other absorbant material) is required. Its is advised to steer clear of using the curtains or other handy soft furnishings as febreze and vanish are not up to the job in hand.
"Why my sweet, do we have time for a 'Shamrocking' before we go to your parents for sunday roast?"
by furball69 March 16, 2010
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