Sound used for a variety of purposes, for example, but not limited to, when someone screws up or does something lame. Can sometimes be heard on game shows.
When you have any two things that are supposed to join together as one to perform a certain function and they don't fit together the correct way they are whompy-jawed.
If you are using a pair of scissors and they don't cut correctly and the blades shift and won't meet like they are supposed to then they are whompy-jawed.