informal, masculine plural 'we' or 'us' — a casual way to refer to a group including the speaker (often used by men).
俺らでこの仕事を片付けてしまおう。
Let's finish this job ourselves.
試合に勝ったら俺らで祝おうぜ。
If we win the game, let's celebrate together.
俺らのチームは今年強くなった。
Our team has gotten stronger this year.
colloquial first-person pronoun 'I' or 'me' (especially in the dialectal form おいら); used informally by some speakers.
おいらはそんなこと気にしないよ。
I don't care about that.
昔はおいら、よくあの山で遊んだもんだ。
Back then I used to play on that mountain a lot.