Blind hole - A hole that doesn’t penetrate the material all the way through. As opposed to a through hole which does go through.
Feel - The secret sauce of working the physical sciences. This is knowing things like how much force, pressure, tension, torque, etc. you can safely apply to a given object. This is largely a learned skill.
WDITOT -“Why Didn’t I Think Of That.” Not to be confused with ID10T, which is another thing entirely. [via Steve Roberts]
Welding boogers - Bad, ugly welds or a weld blob that has adhered someplace where you don’t want it.