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1.
The act of sticking ones finger or other object up another's anus in an attempt to cause discomfort.
Wow Josh was trundling someone so hard that they sharted and pooped a little.
by Bow N Arrow July 26, 2011
 
2.
A replacement for the word Trolling in the Forums of League of Legends. a Popular Online game. Trundle is also a playable troll character in the game.
There sure are a lot of Trundles in the forums today!

Stop feeding the Trundles!

Trundling is an art. True Trundlers Trundle so well that very few people notice they are trundling in the first place.
by Mike Makoliw November 25, 2010