noun
Archaic masculine first-person plural pronoun, used by men in informal or rough speech. Not used in modern standard Japanese; equivalent to modern 俺たち or 僕たち.
「おいらっちはもう行くぜ」と、昔の若者は言った。
"We're off now," said the young man of old.
Derived from おいら (a rustic or informal first-person pronoun) + たち (pluralizing suffix), with a geminated ち. The exact historical development is uncertain, but it is an archaic masculine plural form.