When one exposes themselves to fiction that stimulates our negative qualities (like horror fiction) so that they can work through them in a healthy and harmless environment as catharsis.
Serial killers and other murderers appeal to the impulse Stephen King calls "feeding the alligators," and Carl Jung called "integration of the shadow self," but it all means the same thing: that entertaining our own dark side can be therapeutic.
-- 8-Bit Philosophy
Feeding the troll is when one replies to a troll in retaliation (usually). If somone feeds a troll, it may get cocky and cause an even bigger problem. The best way to deal with trolls is to report them and let the mods banninate the said troll.
Because ants are attracted to protein and fructose, "feeding one's ants" means masturbatingto the point of ejaculation such that the expelled semen attracts a swarm of ants