What where they talking about? "Keppet" [HUGE SPOILER FOR ALL THE ROTE BOOKS]

[Kalo]

So first post and first thread. Might have been talked about.
Just started a re read of AA. After reading hobbs entire collection of books in the elderling world. So, here is my question. Fedwren sends Fitz to the market to get some supplies and while there he buy some nuts from a vender on a blanket. The vender sitting next to the one hes buying from is staring at him and is saying "keppet" over and over then the venders start arguing and wrestling I believe. They were mountain people. What is going on? Something to do with fitz mom? It jumped out at me and I didn't catch it the first time reading. Please enlighten me. Also would like to say I LOVE this series.