In videogame terms, a whore is a player who specialises, sometimes completely, in one or two mechanical actions that are signifigantly more powerful than others and is rarely seen doing anything else. They tend to have little in the way of imagination and not care much for other players.
Whoring favorites tend to be the weapons that, when used 'correctly', allow you to attack without easily being attacked in return. Some examples include the AWP in Counter-Strike, Spider Mines in Unreal Tournament 2004, and Combine balls in Half-Life 2: Deathmatch.
Whores often use game or map exploits and complex scripts
to perform these actions with minimal effort on their part.
They can be easily identified by entering a server, saying "whore!" or "exploiter!" or "scripter!", and noting who replies with "?".