タメぐち· also ためぐち
casual speech; peer language; informal language
Also written ため口
Noun
タメ口ぐちでいいよ。
Casual speech is fine.
こんな喋しゃべり方かたが好すきじゃないなら、タメ口ぐちでいいよ。
Unless you prefer talking like this, you can speak to me casually.