To express a sense of nervousness and anxiety while being exponentially beta.
"Dude I wanna talk to this girl but I don't know if I can do it!"
"Bro just do it, don't kach out about it"
Someone that has a lot of money, most commonly dollars.
peasant: "dude did you hear about josh? he's a Dollar-kaching!"
peasant 2: "what the fuck are you talking about nobody fucking says that you snollygoster"