Mystery Sound on my Macbook - Triggers every 3-5 Minutes! Weiiird problem.

Every 3-6 minutes something is triggering my computer's text-to-speech to say the word "nut." I have zero programs running in the background, I know it is internal because I can see the task operating when I used a sudo fs_usage (screenshot)

How can I find what's causing this sound? I previously fixed this problem by deleting all my system's voice files — but after an update to Mojave the sound files are back and so is the ghost sound. 

I can provide any system reports/files you need but you'll likely have to walk me through the necessary commands, etc. 

Side note: I'm the co-creator of The Nut Button, so more likely than not someone is messin' around and got this bug on my laptop.
wow yup thank you @Ian C. there was a scheduled crontab. I used crontab -l to list all schedueled tasks and crontab -r to remove them

thanks!