It could also mean "Don't eat
the ugali" so I'm certain it's been said.
Formation of the negative Imperative:
Sg: u + si + root (if last letter = ‘a’ it changes to ‘e’
Pl: m + si + root (if last letter = ‘a’ it changes to ‘e’
Example: kukimbia - to run
Sg: u + si + kimbi - a becomes e + usikimbie - Don’t run!
Pl: m + si + kimbi - a becomes e + msikimbie – Don’t run (you all)!
Verb stems ending in other letters than a don't change Ex. kufikiri (to think) - usifikiri (Don't think)
kula - to eat - is slightly irregular since it has a monosyllable stem.
Kula ! - Eat - Kuleni ! - Eat (you all) ! - usile - Don't eat ! - Msile ! Don't eat (you all)!
the negative imperative is actually just the negative subjunctive, used as an imperative. likewise the positive subjunctive can be used as a "polite" way to say an imperative.