I spent a few years of my weekends restoring a classic car. It was very rusty so lots of cutting and welding new panels and patches. The more time I spent on it the more work I found it needed.
Joined a car forum and had to think of a name. I was listening to a lot of Kyuss at the time and the Sizzle of the MIG was fresh in my ears.
They had a song called Tangy Zizzle that starts with a dodgy recoding of a bloke in a car doing a burnout and he says:
"Yeah, yeah put it in gear, baby. Hell yeah, that's what I like about you, baby, you're always on time!"
A song with a car and a burnout and mentioning being on time (which my car was never going to be), Zizzle is close so Sizzle...
So Zizzle it was. Now like others have mentioned, some of my mates call me that. It's a good disambiguator. Matt is too common a name.
Looking at most people's reasons here, I think I clearly over-thought it