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Kilroy Was Here 

An old graffiti that U.S. GI's would write on the walls of occupied areas.This was very popular During WW2 and the Korean war. This Legend of how "Kilroy was here" starts is with James J. Kilroy, a shipyard inspector during WWII. He chalked the words on bulkheads to show that he had been there and inspected the riveting in the newly constructed ship. To the troops in those ships, however, it was a complete mystery — all they knew for sure was that he had "been there first." As a joke, they began placing the graffiti wherever they (the US forces) landed or went, claiming it was already there when they arrived.
Kilroy became the US super-GI who always got there first — wherever GI's went. It became a challenge to place the logo in the most unlikely places. It was said to be atop Mt. Everest, the Statue of Liberty, the underside of the Arch de Triumphe, and scrawled in the dust on the moon. An outhouse was built for the exclusive use of Truman, Stalin, and Churchill who were there for the Potsdam conference. The first person to use it was Stalin. He emerged and asked his aide (in Russian), "Who is Kilroy?"
The Kilroy fad died some time in the 1960s, but can be still seen around the world.
Where ever you go, Kilroy already beat you to it.
"Kilroy Was Here, so piss off"
Kilroy Was Here by --Kilroy-- December 31, 2011
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kilroy was here 

looking up at your lady friend whilst engaged in oral intercourse on her, when she can only see your eyes and nose.
hey, last night I did the 'Kilroy Was Here' on Betty!

Kilroy Was Here 

An American expression used during WWII, typically seen in graffiti. Not much is known about its origin but the phrase and the doodle became associated with GIs in the 1940s. It was also the American equivalent of the Australian Foo Was Here expression that was used during WWI. It mainly features a bald-headed man (sometimes depicted with a few hairs on his head) with a prominent nose peeking over a wall with his fingers clutching the wall. Despite this, his name is not Kilroy (there were many different names for the character such as Smoe, Clem, Flywheel, Private Snoops, Overby, The Jeep and Sapo).
Kilroy Was Here is one of the most notable pre-internet memes
Kilroy Was Here by CelticEagle February 11, 2019
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