in the middle of a conversation; on the other line of the phone

the northeast region of Japan, specifically the northernmost six prefectures in Honshu (clockwise from the northermost): 青森県 (Aomori-ken), 岩手県 (Iwate-ken), 宮城県 (Miyagi-ken), 福島県 (Fukushima-ken), 山形県 (Yamagata-ken), 秋田県 (Akita-ken).

everything

(colloquial) current boyfriend

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

everyone, one and all

Nagoya dialect

The Kansai dialect. Culturally, it is associated with comedy (specifically, ツッコミ) and is sometimes imitated by people from other regions (エセ関西弁(かんさいべん)) to exploit this.

(slang) eating one's bento (packed lunch) before lunchtime (usually applied to middle and high school students)

Kyaraben, a style of elaborately arranged bento (Japanese boxed lunch) which features food decorated to look like people, characters from popular media, animals, and plants.