when a person is mentally intoxicated and finds anything funny while being completely sober. They commonly use the catchphrase 'Na Na Na' and throw back their head when they laugh.
person 1: oh my god what is she doing!! she's running about mad chasing a pigeon
person 2: dude..she's doin' a conlon
person 2: dude..she's doin' a conlon
by I'm-still-not-ready August 5, 2014