the irrational fear that you will be unable to access a restroom because of extenuating circumstances, such as a full pew at church or a long line at a bar
The inability to change programming code in a computer application for fear that the entire application will fall apart. Named after the Hasboro game "Jenga" where players had to remove pieces of a wooden stack until someone removed the piece that caused the stack to topple over.
Due to his jengaphobia, Bob decided to completely rewrite his computerapplication rather than modify the existing code.