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)

Literally everyone, ever. Including the writer of this definition.

(verb) slang, to hit somebody hard in the head or face.

it's an irish penis

Verb.

(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)

(n.)Anything that is passed off as being true Rock n' Roll, but which a majority of people believe otherwise. Fig 1. Limp Bizkit. See also: Creed.

(noun) slang, an underage female who not only insists that she is the age of majority, but tries at great lengths to snare older men for experience.