Is kiti moto a slang word?
Yes. It literally means "burning seat." The idea is that, in cultures influenced by Islam, if you're eating pork you're constantly jumping up to look around and make sure nobody sees you... so it looks like you're sitting on fire.
"Chipsi" = chips! 20201026
French fries in swahili are actually 'vibanzi', not chipsi
What do you mean "actually"? Both are correct and chipsi is more common, so ... no.
Try googling "vibanzi mayai" and see how many hits you get.