Bot is a word that can be used after almost any adjective, verb and proper noun. The word bot is used to mean programmed to be, to perform or to posses only the word preceding bot. If someone is a (insert word) bot, then they are most known for, always doing, always acting like or strongly associated with the the inserted word.
Originally Sting Bot, which means programmed to sting, it was concatinated to just bot to refer to any word that someone seemingly is programmed to do. (See Sting Bot in the urban dictionary for a definition.)
Damn that girl Stacy has slept with the entire football team. She is a slut bot.
That girl has the biggest breast but is completely stupid and boring. She is a Titty Bot.
You spent $20,000 on Cubs gear and game tickets. You are a Cub Bot.