俺 means “I (male, casual)”

おれ · ore

Also: I, myself

Kun'yomi (Japanese reading)
おれ, われ
On'yomi (Chinese reading)
エン

JLPT N1 · Taught in secondary school · 10 strokes

The story

A person (亻) beside 奄, with big (大) sitting on top: picture a big man filling the doorway. 俺 is the rough, confident 'I' of men among friends, too blunt for work, and an 俺様 type acts like the king of everyone.

Used in 俺 (ore, I, male, casual), 俺たち (oretachi, we, casual), and 俺様 (oresama, my high-and-mighty self)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.