everything

(colloquial) current boyfriend

(slang) Alternative form of 彼氏 (kareshi, “boyfriend”)

everyone, one and all

panda / Abbreviation of 熊麝香猫.

everyone and their dog; literally “cats and ladles too”

to give something valuable to someone who does not understand that value: to cast pearls before swine

a Schrödinger's cat

(idiomatic) tiny, not enough room to swing a cat; literally, “a cat’s forehead”

(neologism) Cat ears, as worn or possessed by a human or humanoid.