~の noun:

• guaranteed (to be genuine, valuable, etc.); certified (as genuine, valuable, etc.) ➜ 極めつき

noun:

• pièce de résistance - colloquialism

noun / ~する noun:

• spanking the bottom; spanking - colloquialism

noun:

• threesome - colloquialism

adjective:

• clumsy; unskillful; bungling; poor; bad - colloquialism ➜ へぼ

noun:

• day-dreamer; fantasist - colloquialism - sensitive

noun / ~する noun:

• buying a large amount (esp. of collectible items aimed at kids, such as manga) - colloquialism

interjection:

• fuck you - vulgar - colloquialism

noun:

• affiliate program (of Internet advertising) - colloquialism - abbreviation ➜ アフィリエートプログラム

suffix:

• someone with a liking or characteristic; a true representative of (place) - colloquialism ➜ 江戸っ子

interjection:

• unless one ...; if one does not ... - colloquialism ➜ 無ければ

adverb / ~する noun:

• kissing - colloquialism ➜ ちゅう

expression:

• out of one's league; facing a too tough opponent; outclassed - colloquialism

noun:

• mental health - colloquialism - abbreviation ➜ メンタルヘルス
• mental illnesses - colloquialism - sensitive

particle:

• approximately; about - colloquialism ➜ 許り
• only; nothing but ➜ 許り
• just (finished, etc.) - after the -ta form of a verb ➜ 許り

noun:

• no problem - colloquialism

adverb / ~する noun:

• dashing; classy; posh; new; modern - colloquialism - onomatopoeia
• crisp; crisply; crunchy - onomatopoeia

ichidan verb:

• to be able to see - 'ranuki' equivalent of 見られる - colloquialism ➜ ら抜き・見られる【みられる】

noun:

• crayfish (esp. red swamp crayfish, Procambarus clarkii) - colloquialism ➜ アメリカザリガニ

expression / ichidan verb:

• to be to the point; to be pertinent - prob. originated as a misuse of 的を射る but now in common use - colloquialism ➜ 的を射る

adjective:

• slow; dim - colloquialism Antonym: 頭いい ➜ 頭が悪い

expression / ~よい adjective:

• bright; intelligent - colloquialism Antonym: 頭悪い

expression:

• not sleeping a wink; wide awake all night
• without moving - colloquialism

expression:

• like water off a duck's back; urine on a frog's face [literal] - colloquialism ➜ 蛙の面に水

interjection:

• Hi - possibly from おっす - colloquialism

expression:

• matter being discussed (e.g. in a private conversation) - colloquialism ➜ こちらの話
• our side of the story (in contrast to another's version)