Got mine when I was a framer. Was my 2nd day on the job, we were really busy and skipped coffee. It got around lunch and seemed like we were going to skip that too. I was hungry so when I was grabbing some nails I nabbed an apple and put it in my tool belt. I climbed back up on the roof and started eating it as I was waiting to get some more trusses. Lead hand yelled, "Hey! what do you think you're doing?" I said, "having a snack", there was some underbreath cursing from his end followed by "It's NOT snack-time yet!" (I still finished the apple...)
Stuck ever since. By day 3 nobody in any of the four crews, including the boss ever called me Tyler again. Snack Time became my full name. Usually just Snack.
I was surprised my boss never accidentally wrote it on any of my pay cheques. A few of the lead hands even forgot my actual name after about a year.
Just picked an interesting way to spell it for my handle that nobody else seemed to be using.