The washlet mistery

When I arrived at my homestay in October 21st, of course I was excited about having a washlet home, it was basically the first time I saw one!

Curious and determined to know the meaning and also to know what to press after my business was done, I immediately decided to translate the buttons:

弱、強　Oh, I know those kanji! Weak and strong, must be the intensity of the water I guess!
スポット、ワイド 　 Spot and wide? Maybe to target something more accurately? Oh whathever.
低、高 　Low and high, with the kanji above from temperature and dry, it should be air temperature, ok.

中止（ちゅうし）stop　おしり bum　ビデ bidè　乾燥（かんそう）drying...

...Wait, what is this しげき?

Google translate doesn't translate it. When I press it, nothing happens. And,
it's linked to おしり? That's weird...

I try to ask Sage, but she doesn't know either.
I try searching online, can't find anything, and it's still too soon for me to search in Japanese.
I ask my host mothe- of course I don't, I'm embarrassed to.
One day it comes up while talking with Hana-sensei. She looks perplexed too: 「古そうなウォシュレット」 (seems like an old model washlet) she says.
Seems unusual even to Japanese people.
I decide to give up, guess I'll never know...

...Until one day.

I'm on Hellotalk practicing with this one Japanese friend and finally, after 3 months, I have my answer:

しげき= stimulus, impulse.

Applied to a washlet, basically a jet of water that "stimulates the anus to help you pass stool".

...

Always believe in yourself and never give up on what you really care for.
I hope you can pass stool easily, until next time.