pronoun
Highly derogatory second-person pronoun used mainly by men in rough, confrontational, or very casual speech. Equivalent to 'you bastard' or 'you jerk'. Not used in polite conversation.
See also: 手前 (てまえ)
てめえ、何見てんだ！
What the hell are you looking at, you bastard!
てめえのせいで台無しだ。
It's ruined because of you, you jerk.
pronoun
I; me; oneself (rough, masculine)
Rough, masculine first-person pronoun or reflexive use. Can express defiance or tough-guy attitude. Also used in set phrases like てめえの (one's own). Less common than the second-person use.
てめえで考えろ。
Think for yourself, damn it.
てめえのことはてめえでやれ。
Take care of your own damn business.
Kanji form is rare for this reading; usually read as てまえ with a different meaning.
Originally a compound of 手 (hand) and 前 (front), meaning 'before one's hand' or 'oneself'. The reading てめえ is a contraction of てまえ. The derogatory second-person use developed from the reflexive meaning, similar to how 'yourself' can be used aggressively in English.