An act that involves pulling your collar up and over your neck. Despite looking moronic, and defeating the purpose of collared shirts (looking somewhat respectable), this has somehow become a fashion trend.
John Smith: Wow, look at that moron's collar pop.
Me: I really wish clothing companies would start writing 'douche' on the inside of collars. Maybe being labelled a douche by their own clothing whenever they pop their collars would be enough incentive for them to stop.