友とも達だち言こと葉ば

noun

casual speech; friendly language

Refers to the informal, casual way of speaking used among close friends, often characterized by plain forms, slang, and dropped particles.

• 親したしい友とも達だち同どう士しでは、友とも達だち言こと葉ばで話はなすのが普ふ通つうだ。

  It's normal to speak in casual speech among close friends.

• 目め上うえの人ひとに友とも達だち言こと葉ばを使つかうのは失しつ礼れいにあたる。

  Using casual speech with a superior is considered rude.