What it says on the tin. I remember that you would sometimes, randomly, be able to get a "fast past for ToTing". However, this year, I've been ToTing a lot - and so far, not a single "fast pass", when in previous years I'd get them frequently.
What happened?

I think they got rid of it this year to allow for the TOT at a random user's house to be a thing. Considering if you follow that link you can TOT a lot more.
: From my experience of ToTing this year, my wait time always seems to be about the same, even with random ToTing random people, or about 10 minutes per house. Compared to previous years, it just seems like a much longer wait time to me overall.

I've been getting 5-ish minute waits with the random link
I'm not sure if they've completely gotten rid of it, because I just noticed on my buffs page I have the candy corn image that says "Expires in 24 minutes 50 seconds."
Although the buff isn't showing on my sidebar like they usually do. So I'm not 100% sure, but it seems like it's bugged or something.
At no time does the Fast Pass show up in the widget where it's supposed to.
I don't notice the Fast Pass with Trick or Treating. If it's working for those, the variation in time is so small that it doesn't matter.
But with Egging or TPing it does happen, time drops from nearly a half hour to only ten or so minutes. It didn't occur to me to look on the buffs page.