[regarding me, between two Jews]
"Iz er a yid?" (Is he Jewish?)
"Avade iz er a yid." (Of course he's Jewish.)
What was next said, as I first heard it:
"Er kikt oys vi a narisher." (He looks like an idiot.)
I said "Vos?" (What?)
"Ir kikt oys vi an arisher." (You look like an Aryan[?].)
"Vi an arisher!"
Oh! I get it. Like an "ayrisher" ("Irisher" in non-"YIVO" Yiddish, Irlender in standard Yiddish), in the speaker's pronunciation - "arisher."
Thus was I saved from getting in a fight with two older men on the Lower East Side (probably avoiding a beating in the process).