when someone goes over the top in trying to show their irish pride. most often used to describe people of irish ancestory trying to show their "irish-ness" on St. Patricks Day
Guy One: Dude all these people look the same at this St. Patricks Day parade with their Guiness Hats, IRA T-Shirts, and lepercaun pants.

Guy Two: Yeah dude they're all totally Shamrocked!
by M. Harty December 04, 2006
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 27, 2004
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 04, 2009

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