Etymology
From Proto-Hellenic *kakkajō, from the Proto-Indo-European Lallwort root *kakka- (“to defecate”).[1]
Related to Latin cacō, Middle Irish caccaim, Old Armenian քակոր (kʻakor), Middle Armenian քաք (kʻakʻ), and German kacken.
The word may or may not have the same origin as bad, κακά.
In Dutch, KAK means SHIT. So right on the money.
You are not alone:
κακκάω
The word may or may not have the same origin as bad, κακά.
Kacke in German.