I know you are but what am I

A childish, teasing response to an insult. A: "Monkey brain!" B: "I know you are but what am I?"

Name	Pronounced	Usage
Astride	-	French
Valentyn	-	Ukrainian
Fabianus	-	Ancient Roman
Trevino	[trə'vi:nəu]
Jannike	YAHN-ni-ke (Swedish)	Norwegian, Swedish, Danish
Unnr	-	Ancient Scandinavian