A translation of the entry in Kamus Besar Bahasa Indonesia for kecap (bearing in mind that c in Indonesian is pronounced with a ch sound):

kecap: n 1. liquid or sauce produced from processed soya beans to which sugar and spices are added and used as a food flavouring. 2. bragging, empty talk.

The dictionary doesn't give etymologies, but presumably it's related to the previous entry for another word kecap, which is longer than I feel like typing, but the basic meaning is: movement of the mouth (opening and closing it tightly) such as when eating so as to give rise to the sound cap,cap. As a verb (mengecap), it means to smack the lips, or to taste food.

Bingley

Bingley