こいつ， こやつ， 此奴
1. he, she, this fellow, this guy, this person
2. this, this one, this thing
3. hey, you!, you bastard!, damn you!
tbd
こいつの性根が悪いから非モテなんだろ。
tbd
I expect it's his lousy personality that drives off the ladies.
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一郎はどことなく傷ついたように言ったが、それが嘘っぱちであることはこいつとの長年の付き合いが教えてくれた。
tbd
Ichiro sounded somehow upset but my long years of hanging out with him told me that it was out and out fake.
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こいつがそんな玉じゃないことなんてとうの昔に解っていたからさ。
tbd
That's because, you see, I've known he isn't that sort of person from a long time back.
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こいつ、さっきまで俺の相棒だったのに、もう寝返りやがった。
tbd
This rat, up until just now he was my partner and now he's gone and turned on me.
这家伙刚刚还是我这边儿的人，现在已经叛变了。
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僕にはこいつが理解できない。
tbd
I can't understand this business.
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もうホントにこいつは優柔不断で、イジイジした奴だ。
tbd
This guy is really wishy-washy. He couldn't make a decision to save his life.
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こいつは困ったぞ。
tbd
Here's a fine how-do-you-do.
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こいつはどこの馬の骨だ？
tbd
Who's this nobody?
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