ｉｎｇ

noun, used as a suffix

doing ...; in the process of ...

Slang suffix attached to nouns or verbs to indicate an ongoing action or state, borrowed from English -ing. Used in casual, often online or youth language.

• 今いま、勉べん強きょうｉｎｇだから後あとでね。

  I'm studying right now, so later.

• ダイエットｉｎｇ中ちゅうなので、甘あまいものは控ひかえてます。

  I'm in the middle of dieting, so I'm avoiding sweets.