I'm not familiar enough with that property (Turing Complete) to evaluate the question. I have not looked at the API or programming base for Slack but i would guess that you can write your own web hosted software and provide handles into and from slack,
So probably.
There are a large number of applications here https://slack.com/apps
One might assume that you could define behavior as arbitrarily as you'd want to, based on the variety of apps and their uses.
I began my training regimen and only spent a few days in it...
I am ready and willing to continue learning this language, even more so to converse with my bretheren!
OMG SO MUCH YES! https://limnu.com/slackwhiteboard/