shamrack 

1. The appearance of a woman's breasts that look larger than they are from excess padding from a padded bra.

2. A padded bra.

Swank: "Damn, that girl has enormous boobs."

Garren: "Nah, she's sporting a shamrack. Stormer saw her with her top off."

shamrack by Garren August 4, 2007

Shamrock Shower

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!

Shamrock Shower by opeake April 12, 2011

woah shamrock 

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!"

woah shamrock by ChesterChes May 14, 2017

Shamrock Shit

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.

Shamrock Shit by MichelleS February 29, 2008

shamrock 

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....

shamrock by cailin beag August 30, 2003

Shadrack

A prophet from the bible

Shadrack is such a great prophet

Shadrack by Familyrecordj May 16, 2018

Shake your Shamrocks 

something your drunk self says to an on-coming woman on St. Patrick's Day.

hey baby let me see you shake your shamrocks!

Shake your Shamrocks by bubbles5587 March 24, 2017