よう
yōo tasu

Godan Verb (su)
Expression

1. to take care of some business; to go on an errand

Godan Verb (su)
Expression

2. to relieve oneself; to do one's business; to go to the toilet

とにかくメシ・・・といきたいところだが、その まえ よう すことにした。
tonikaku meshi...to ikitai tokorodaga sono maeni yōo tasu kotoni shita.
Anyhow, lunch ... is where I wanted to go but I decided to go to the toilet first.