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1)A mis-pronunciation of the phrase "je Francais," meaning, "I'm French."

2) A spectacular male human phenomenon occurring ever-so-rarely. Gifted with a voice like the fucking crack of doom. Completely incorrigible in both behavior and attitude. Often wears stupid but funny t-shirts. Fears no shot or beer. The presence of one usually results in copius drinking and fornication.
"Man, Taylor was smashed last night. After that 14th Irish Car Bomb, he went straight Jay French on our asses!"
by whorebeezy March 20, 2010
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