(informal, humorous) A phrase used to feign ignorance to the existence of a concept.

(colloquial) current boyfriend

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

everyone, one and all

"to end as a fruitless blossom": to end without bearing fruit (results)

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

what

what / that thing (used in place of words you can't remember at the moment.)

nothing, none (used with things)

masturbation (manual erotic stimulation of the genitals)