also: オレりゅう
noun
one's own way; one's own approach
Used to describe a self-styled, often assertive or idiosyncratic method, especially by a man. Conveys a confident, sometimes stubborn, personal style.
彼はいつも俺流のやり方で仕事をする。
He always does his work his own way.
料理は俺流で、レシピ通りには作らない。
I cook my own way, not following recipes exactly.
Compound of 俺 (ore, assertive masculine 'I') and 流 (ryū, style/manner). The exact origin is uncertain, but it likely emerged as a colloquial expression emphasizing a personal, self-determined approach.