A person who will undertake the act of being a sleaze at any opportunity. This is accentuated when the sleazeberry is under the influence of alcohol, and can reach dangerous levels when there is both alcohol and large numbers of attractive members of the opposite sex in the vicinity.
To play the role of detective, to gather facts and information usually in the traditional Sherlock Holmes inconspicuous way.
To investigate in the manner of a detective.
A proper Sleuth needs to be intelligent, witty, and always a few steps ahead others. In fact, he never reveals all his discoveries or conclusions. His wisdom is his greatest asset and he needs to hide that wisdom if he expects to be hired for his services.
An outsider that is too awkward to introduce themselves, but is obviouslyintrigued and won't stop studying your every move from a safe distance. They are usually unaware that you are aware.