also: こっちとら
pronoun
Colloquial, often rough or emphatic first-person pronoun. Can refer to the speaker alone or the speaker's in-group, depending on context. Common in masculine or informal speech.
こちとら、そんな話は聞いてねえぞ。
I haven't heard anything about that.
こちとら忙しいんだ、後にしてくれ。
We're busy, so leave it for later.
Variant pronunciation and spelling, slightly more casual.
Contraction of こちら (this direction/person) + とら (pluralizing suffix, from 等). The exact derivation is uncertain, but it likely developed as a colloquial, emphatic first-person pronoun.