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1.
A counter-troll is someone versed in the art of disarming an online troll, usually by out-witting, out-exasperating, or purposefully failing to be antagonized by the troll's actions.

These actions are different from feeding the troll as the latter involves giving the troll ammunition and sating its hunger for chaos and bedlam, whereas counter-trolling involves responding to the troll in a manner that leaves him/her with nowhere to go in terms of antagonistic actions, and will likely deter him/her from further trolling.

Note: Counter-Trolling must be done very carefully, as a desperate troll won't understand what's going on and resort to general pandemonium, resulting in combustion, turning the troll into a flamer.
TROLL: Counter-trolls are gay.
COUNTER-TROLL: ...and?
TROLL: That means you like it up the ass.
COUNTER-TROLL: ...and?
TROLL: That means you have a boyfriend you faggot.
COUNTER-TROLL: ...and?
TROLL: ...
TROLL: Fuck you.
*TROLL has signed off*
COUNTER-TROLL: Awesome, now I can wrap up my activity here in peace and quiet, go home, and sleep with my wife.
by KnaveryAbounds March 11, 2011
 
2.
When you avoid a troll's trollish act (or taking it deep) and countering it by successfully trolling him/her back. This action is hard to pull off.
Student: *sitting in classroom with a female teacher and other students*

*The female teacher starts reminiscing about her past*
Teacher: "Back in my day my friends used to call me shortstuff cuz I'm short."

Student's troll comment: "I wonder how long ago that was?"

*Whole classroom laughs*

Teacher's countertroll comment: "I don't know, why don't you ask your father?"

Classroom: You just got countertrolled!
by Chris's_Zen May 05, 2013
 
3.
to troll a troll that trolled a troll who trolled a troll
random guy : i herd u liek mudkipz
troll1 : i no liek mudkipz, mudkipz r n00b
troll2: i liek swampertz
troll3 : noes swampertz r trollish
troll4: tr00lllls cannot squirt water u idiot
troll5: fuck you they use hydro pump not squirt water you idiot go rot in hell pig!@#$!%!@fucker
troll4: you got trolled retard
troll5: you got countertrolled troll!
by master of trolls October 26, 2010