Where does “なにそれ？おいしいの？” come from?

なにそれ？おいしいの？ (Japanese) comes from Japanese それ, from Japanese れ, from Old Japanese れ — nominalizing suffix used to form pronouns, often from demonstratives: one, thing.

なにそれ？おいしいの？ (Japanese): used to feign ignorance to the existence of a concept

Definitions

used to feign ignorance to the existence of a concept

Ancestry of “なにそれ？おいしいの？”, step by step

なにそれ？おいしいの？ traces back through two separate lines of ancestry.

via Japanese それ

Step	Language	Word	Meaning
1	Japanese	それ	that one near you; the one we are talking about;...
2	Japanese	れ	nominalizing suffix used to form pronouns, often...
3	Old Japanese	れ	nominalizing suffix used to form pronouns, often from demonstratives: one, thing

via Japanese 何

Step	Language	Word	Meaning
1	Japanese	何	What?, Huh?; what; that thing

Every word from Old Japanese れ →Every word from Japanese れ →Every word from Japanese それ →