An awkward boner that a man gets during a family gathering or in a public place like a mall or restaurant where people can see it and stare at it.
Man 1: "We were all in the family room after dinner, getting ready to open presents, when I suddenly had to go to the bathroom. When I stood up, I looked around the room nervously and noticed my brother's wife staring at my crotch. Then the other family members including my mother had noticed the renegader that had formed in my pants. I was so embarrassed that I ran to the bathroom and stayed in there until everyone left."