Top Definition
The act of posting to an Internet forum or engaging in some other sort of online discussion while taking a dump. Generally the turdcaster will be using a tablet device, but smartphones, laptops, or even a desktop PC (for the truly dedicated) will work fine.

The phrase was coined on The Awful Forums in mid-2010.
"Why don't you want to FaceTime?"
"Dude, I'm turdcasting"
by Chose Warrior November 16, 2011

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