nobleheart: This is what I came up with:

Foghorn Leghorn is a large animated rooster appearing in numerous Warner Brothers cartoons. He first appeared in 1946 in a Henery Hawk film entitled Walky Talky Hawky. Foghorn Leghorn is considered a significant Looney Tunes character, whose sidekick/nemesis was The Barnyard Dog. Many of the gags involved Leghorn and the dog trying to outdo and punish each other.

His voice was created by actor Mel Blanc, heavily patterned after the character of Senator Claghorn, a blustering southern politician who was a regular character on the Fred Allen radio show. Senator Claghorn was created and voiced by radio comedian Kenny Delmar. Foghorn Leghorn used a number of Claghorn's catch phrases, like "That's a joke... I say, that's a joke, son". The references to Senator Claghorn were obvious to much of the audience when the Foghorn Leghorn cartoons first premiered, but like many of the references in WB cartoons of the era, they have since become dated and "go over the heads" of most modern-day audiences.

A leghorn is a breed of chicken, and foghorn describes the character's loud, overbearing voice. At its most raucous, it sounds similar to Blanc's Yosemite Sam.