inside joke

a joke that only certain people understand; a joke understood only by people who know certain facts and context. What you said must be an inside joke. It makes no sense to me.

Common Names:

Name	Pronounced	Usage
Gilda	-	Italian, Portuguese
Yngvi	-	Norse Mythology
Odilie	o-DEE-lee-ə	German (Archaic)
Kemen	-	Basque
Venkat	-	Indian, Telugu, Kannada, Tamil, Malayalam
Heron	-	Ancient Greek