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1.
A "troll-bump" is the exact same thing as a "fist-bump" (search "fist bump" if you don't know what that is) but used among and between trolls upon successful trolling.
*class was canceled*

Troll 1: Mark, you're late for class! Ask Troll 2!

Mark: Really troll 2?!

Troll 2: Yes! Hurry, run!

*Mark runs off to class*

Troll 1 and Troll 2: *Troll-bump*
by Umad_Khattak January 07, 2012