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1.
In December 1946 the New York Times credited James J. Kilroy, a welding inspector at the Bethlehem Steel shipyard in Quincy, Massachusetts, with starting the craze. Usually, inspectors used a small chalk mark, but welders were erasing those to get double-paid for their work. To prevent this, Mr Kilroy marked his welding work with the long crayoned phrase ("Kilroy was here") on the items he inspected. The graffito became a common sight around the shipyard and was imitated by workers when they were drafted and sent around the world. As the war progressed, people began opening void spaces on ships for repair, and the mysterious Mr Kilroy's name would be found there, in sealed compartments "where no one had been before."
"Kilroy was here..."
 
2.
... was here.
*spraypainted on the wall*

Kilroy was here!
by Kilroy January 13, 2004
 
3.
When your cock head peeks up over the top of your jeans or underwear elastic band
Hey, check out that dude's kilroy.

That poor fucker. His cock is too small to do a kilroy.

Hey ladies, want to meet kilroy?
by bookemdanno July 23, 2010
 
4.
A human like sub species, who prefers dark enclosed spaces. Usually has two feeble arms which it is unable to support fully, and often collapses in a fit of panic at the call of a siren. In popular slang, a kilroy is someone who shows no sense of self respect or makes no effort with their physical appearance.
Ted: What's that stain on your jeans man?
Damien: oops bbq sauce, I had it for dinner on Wednesday
TEd: Dame, you are the ultimate kilroy
by nuuiopol February 07, 2011
 
5.
A chat programme about the strangest of subjects that is on at 9am on BBC1 most of the time. Very silly.
And now the people without a piece of skin on their left kidney unite and tell us of their grief...
by shiieru September 06, 2003
 
6.
1 : Rocky Martin... DUHRHHHH...
2 : And me
"I AM JESUS! HEAR ME CHILD!
"Kilroy was here"
by Plumberry March 30, 2005
 
7.
Someone with a huge mole on their upper lip, sometimes can be up to the size of a large marble. Use of the word should be after their name, and accompanied by the word meat
Clayton Kilroy, meeeeaaaaat!
by The Man with a Sack of Mince September 29, 2007