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1.
A slang term for "post-traumatic stress disorder". A condition which often occurs for those who have been in active combat. Can affect the body in various ways, but can be treated.
He was suffering from a serious case of shell shock after 'nam.
by Xerxes November 11, 2004
 
2.
A mental Disorder caused by active warfare
World War 2
by William Nanemahoo December 12, 2003
 
3.
A condition usually found in Soldiers, where a traumatic experience forces the person into a state of shock, such as being in the proximity of an exploding Artillery shell (Hence Shellshock). They are quite often rendered completely incapacitated without suffering any physical damage. This is also often confused with PTSD.
The Marine began to run across the pitted sand, when the Howitzer shell hit next to him. He was launched into the air, and when he landed, he lay stiff as a board, on the verge of sobbing, he had been shellshocked.
by ... Awww, Fuck this. March 08, 2010
 
4.
Interjection: used by ninja turtles to express negative feelings of surprise or sometimes pain.

We're out of pizza and the footclan stole Mike. SHELLSHOCK!
by Battletoad_G April 05, 2009
 
5.
A condition that occurs only in high school guidance counselors. Those affected will spend hours at grocery stores running tests on eggs looking for the perfect carton. They usually become angry when people suggest they mix and match the eggs.
Dante was about to call the cops on a Shell Shocked counselor in the Quick Stop, but a woman told him not to worry about it, because they always pay for what they break and clean up after themselves
by KossB May 01, 2006
 
6.
From the epic conker matches of your childhood. The tear-jearking moment when your (one hundred and eightier) conker loses a part of its shell after a well aimed blow from your opponent.

Usually a sure fire precurssor for a conker match defeat.
"OOOHHH! He's just got a shellshock! he's lost it"
by Myxomatosis August 04, 2005
 
7.
Uncontrollable shaking that usualy happens on the first day of a new school year.
Person A: Whats up wit Jim?
Person B: Oh, he just has shellshock, its the first day of school.
by TOOSOOabi September 24, 2007