in league of legends, you farm minions to get gold and xp, to snowball and get stronger; to get farmed, which applies in any game, means you're getting pooped on, and just feeding kills and xp to the enemy
Verb: To get beaten on the river in Texas Hold'em despite having strong odds of winning, and making good bets. Especially to have this happen regularly to the same opponent who consistently defies the odds of poker.
Tom had Kh Kc, Joe had 4h8d. Flop was Kd, 5c, 6h. Turn 2d. and the river was a 7s. "Tom just got Farmed by Joe" or "Joe sure farmed Tom." "damn Tom you just got farmed"