Shamlock 

Person who sits in the back of class pretending to be constantly high, but has never actually smoked weed.

Will Beaver is a shamlock.

Shamlock by Steve Burke March 20, 2003

Spamlock 

Similar to traffic gridlock. Occurs when a fanbase will overload a message board with threads asking to save their show ( that is in danger of cancellation).

Spamlock has cluttered the boards.
...or...
This spamlock has been going on for days.

Spamlock by amnesiavictim April 14, 2009

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

shamockery 

Sham + Mockery = Shamockery

- not only false, but scornfully contemptuous in it's incorrectness.

Daniel wasn't even a magician, in fact his performance was a shamockery to magic itself!

shamockery by Darkko August 12, 2005

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