(Internet slang) a dead fad; out of fashion; no longer trendy

(mathematics) quod erat demonstrandum (that which was to be proved)

(colloquial) current boyfriend

everything

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

everyone, one and all

having a comeback or excuse for everything one is told, being smart in the sense of having a smart mouth

rare word, unusual word

後日: in the future, later, a later day, another day; after the occurrence of some event, etc / 期日: an expected or promised day

in the future, later, a later day, another day / after the occurrence of some event, etc