To pull the wool over somebody's eyes, you are not completely truefull with them.
Commonly associated to wheeler dealers and other salesmen who sell shoddy goods which are not up to standards.
The word Tricky can be used as a nickname or in sentence.
Tricky Micky- nickname for someone who sells shoddy goods and is also named micky. Also a famous entrepeneur who made it big on eBay 4 years ago.
Your Tricky- something you call them if they have mugged you off/made a fool you with one of their sales.