References all criminals, or people who scare others very deeply. One may be unsure what this "Kaiser Soze" person is capable of. It is a good bet that the worst one can imagine is probably true, or close to what they are capable of. An unpredictably violent person. One who takes great pleasure or care in their violence and deception.
The character Kaiser Soze in the movie Usual Suspects.
A legend about an Eastern European criminal who was once stuck between a rock and a hard place and he killed his wife and two children just to show his opponents that he meant business. Ever since then other criminals tell the story to their kids at night - rat on your pops, and kaiser soze will get you!
a person who just ups and completely disappears suddenly from a relationship without warning, much like the character of the same name from the film "Usual Suspects" did after suppousedly committing a crime.
"we spent the whole weekend together and then he pulled a Kaiser Soze. haven't heard from him in 2 weeks. fucker"