Ooops, looks like they had an accident! What a shame...

Trigger word:

wetting [clothes type]

Additional words to increase/control the concept:

wet spot on [clothes]
dark spot on crotch
peed her [clothdes]
[clothes] dripping
dripping down on leg

Replace the [clothes] with what the character is wearing.

Limited testing on males, but it seems to work.

Dataset was both male and female, but majority female.

It's possible that it may also work on other similar concepts.