Pulling a dick move is engaging in an egregious, selfish and usually public stunt, i.e. a cock-block or dumping a workload unnecessarily upon a friend or coworker. The exclamation of the phrase "Dick move!" in a high, nasal voice is sometimes the only socially acceptable recourse. Other common reactions include "Shenanigans!", "Bullshit!" and, a personal favourite, "BULLSHIT SHENANIGANS!".
John likes Cindy. Erik likes Cindy. Erik and John are friends. Erik intentionally keeps Cindy busy at a party ("cock-blocks" John). John finds out about it after the fact, and yells "Dick move!" Given the nature of their friendship, violence may or may not occur.