# Ulch!
"Ulch!" is an expression of revulsion that is seen in a few circumstances:

Eating a tainted corpse: "Ulch - that 

<food type=""> was tainted!"[1]
Eating a rustproof item while a rust monster: "Ulch - that <item> was rustproofed!"[2]
Quaffing a cursed potion of gain ability: "Ulch!  That potion tasted foul!"[3]
Quaffing a cursed potion of restore ability: "Ulch!  This makes you feel mediocre!"[4]
Inhaling vapors from either of the above: "Ulch!  That potion smells terrible!"[5]
A false rumor: "Ulch!  That meat was painted!"[6]
References

↑ src/eat.c in NetHack 3.6.6, line 1619

↑ src/eat.c in NetHack 3.6.6, line 2500

↑ src/potion.c in NetHack 3.6.6, line 917

↑ src/potion.c in NetHack 3.6.6, line 600

↑ src/potion.c in NetHack 3.6.6, line 1629

↑ dat/rumors.fal in NetHack 3.6.6, line 361

</item></food>