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The full sentence is 「ちょっと こいや」.
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2015-03-19T04:32:37.337
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meaning spoken-language imperatives
What does the word 「こいや」 mean?
It's not a word on its own, but a combination of 来い (imperative "come") and や
(see #3 in [this dictionary
entry](http://dictionary.goo.ne.jp/leaf/jn2/220994/m0u/%E3%82%84/)).

As l'électeur pointed out in the comments, it can be understood as a "tough
guy's imperative."
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2015-03-19T04:59:00.103
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This means _come here_ and it is quite casual.
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2015-03-19T05:37:56.823
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As l'électeur said, it definitely shows tough guy's commanding nature. For
example consider the following statement:

> そんなの忘れてちょっくら晩飯でも食いにこいや。
>
> Forget your troubles for a while and come and have dinner with us.

In the statement above

> ちょっくら means a little
>
> 晩飯 or ばんめし means dinner
>
> 食い or くい means eating

As you can understand from the context, the speaker's statement has somewhat
demanding/commanding nuance attached to it. I think if you understand the
nuance, you will understand how and when to use it.
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2015-03-19T08:27:17.007
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