Kilroy was here! key ring

Kilroy was here is an American popular culture expression, often seen in graffiti. Its origins are debated, but the phrase and the distinctive accompanying doodle—a bald-headed man (possibly with a few hairs) with a prominent phallic nose peeking over a wall with the fingers of each hand clutching the wall—is widely known among U.S. residents who lived during World War II.