To have disaster befall one, especially pertaining to electronics and technical systems.
To be left wondering what is happening.
To be given incorrect information.
"Make sure you get it done; don't chach me again!"
"What do you mean the price is twice what I thought? Don't tell me I got chached again?"
Derived from: The epic doucher Chachi played by an even more epic doucher, Scott Baio, on the television programs Happy Days (1974-1984)and Joanie Loves Chachi (1982-1983).