I make up my own words quite regularly to express an emotion. I have since I was a kid.
Zagadouche "zag ah doosh". I say it when something good is happening, or if I complete a task I've been working on for awhile.
Ballzak "ball zack". Something bad just happened. It started with balls and despite what anybody thinks, "sack" never had a place there.
It's like speaking in tongues to most people, but without the seriousness that religion attaches to it.
Ds, Gs, Vs, Bs, and Os are warm sounds. Ts, Ss, Ks, and Ps are cold sounds. There's no real formula for it, but I don't cuss nearly as often as most people I know. Gibberish is more whimsical than profanity. Nobody gets offended by it, and it sometimes starts a conversation.
Sometimes I'll have one going for so long that it evolves. When I was a kid with a cold, I'd call for "Bom" instead of mom. It changed to Bob. Then as I got older, I added the affectionate -le ending to make it Bobble. "Hey Bobble. How's it going".