nail biting

(colloquial) current boyfriend

everything

(literally) To bite one's own navel / (idiomatic) To be deeply regretful about something

Same as above.

(of pets, animals, etc...) play biting

to force someone to clamp with their teeth, to force into someone's mouth (e.g. a gag) / to wedge into a space / to inflict (a blow), to deal (a hit)

to chew, to digest / to fully appreciate, to fully understand

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

everyone, one and all