The Japanese pronoun '俺 (おれ)' is a casual and masculine way to say 'I'. It is commonly used by men in informal settings, such as among friends or family, and can convey a sense of toughness or assertiveness. However, it is considered rude or inappropriate in formal situations or when speaking to someone of higher status. For example: I will do it「俺がやる」(おれがやる). I am strong「俺は強い」(おれはつよい). Note that women typically do not use this pronoun, as it is strongly associated with male speech.