Luganda

Then it dawned on her. He did not know any Luganda. All along he had not understood a word she had said.

A novel abusive word for a resident of Lugansk "Lugan-don/Lugansk-condom" can be explained as either an agglutination of the two words "Lugansk" + "condom" or as a reference to a mythological country "Luganda" whose name comprises component "Lugansk" and "Uganda".