The fear of the things you say being misinterpreted with a definition found on Urban Dictionary. This fear is grounded in some sort of public humiliation event typically causing PTSD.
Suzie: Why doesn't John talk anymore?
Bill: He suffers from "Urbaphobia." He got it one day when he said "Oh, like a mini van?" and everyone busted out laughing. He was told to look it up on Urban Dictionary and after he did, he feared saying anything ever again. I guess you could call him an urbaphobe?!
The fear of definitions from urban dictionary
Why the fuck am I reading this I have urbaphobia