I assummed you meant: Check somebody out.
If so, it means:
1. To search somebody
2. To find out somebody's background.
3. To make sure he or she is clean
1. to get more information about someone, especially so that you can find out if they are suitable or good, or whether what you have been told about them is true.
e.g.
Check us out on our new website.
(請)到我們的新網站獲取關於我們的資料。
2. to look at someone because they are interesting, attractive, unusual etc.
e.g.
I turned around and caught Bill checking me out.
我轉身發現 Bill 注視著我。
3. to add up prices of a customer's products in a store and take payment for them.
e.g.
I can check you out on cash register 5.
我可以在 5 號收銀機為你結帳。