Trolling for Dick (abbreviated as
TFD) is a joke/insulting reference to the popular website Chatroulette that pairs random strangers for webcam-based conversations.
Due to the odd anonymous exhibitionist nature of many males who use this site, one who visits Chatroulette are quickly introduced to penis. No matter how many times one clicks 'Next' the penis lies in wait, in various shapes, sizes, and colors being stroked, slapped, choked, petted, or merely just hanging out.
This overabundance of penis on Chatroulette is commonly referred to as 'Trolling for Dick' as you can never truly be free of the penis of a random stranger via Chatroulette's easily (and unfortunately) turned on webcam user base.