afk=away from keyboard or maybe a free kill
People use the term "farm bot" to make "AFK bot" sound better. AFK bot's protect's you from being kicked from a game for being idol. There are really only 3 types of bots - AFK bot, Auto ready up, Auto killer. On-top of that there are functions that are added. Like Auto re-join cows, New room creator, Server crash protection, Auto log-in. I dunno Heaps of shit.