Colloquial, masculine first-person pronoun. Derived from 俺 (おれ) with a casual suffix. Used among close friends or in rough, informal settings; can sound tough or playful.
I've got the day off from my part-time job today.
Rare plural use, possibly influenced by 俺達 (おれたち). Not standard; most speakers use 俺ら or 俺たち for 'we'. Included for recognition.
See also: 俺たち
Just leave it to me!
We're all going to the beach tomorrow.