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
Willie	['wili]
Naamah	NAY-ə-mə (English), nah-ah-MAH (Jewish)	Biblical, Hebrew
Christoffer	kris-TOF-fer (Swedish)	Swedish, Norwegian, Danish
Theothelm	-	Ancient Germanic
Baltasar (2)	-	Biblical Greek
Bogumir	-	Medieval Slavic