Wow, that is a great question Redless. I apologize.
Durdle is a bit of lingo that we picked up from, presumably, the MtG community.
In Puzzle Strike, durdling means to lose sight of the objective (winning) in favor of building a Really Fancy Deck.
This often takes the form of building engines with no payload. In PS, an "engine" is a bag with high density of chips that give you more chips and more arrows. So an engine deck that is highly efficient can draw and play every chip in its bag every turn. But without having combines and crashes, the deck can't actually win.
Durdling often occurred when playing against the Unity webplayer bot, which was not very good. Other examples of durdling include trying to set up plays that significantly overkill the bot (one of the Steam edition puzzles builds on this idea, in fact), or trashing down to less than ten chips using Degenerate Trasher or similar strategies, or trying to see how many bank stacks you can empty before you or the bot dies.