katakana coy demonstratives (アレ/ソレ/ナニ)

Demonstratives それ, あれ, なに written in katakana (ソレ, アレ, ナニ) to function as deliberately vague, coy stand-ins for things the speaker doesn't want to name directly — typically sex, menstruation, illness, or other taboo or embarrassing topics. The katakana orthography signals 'you know what I mean' without naming the referent.