1. to tuck your collar into your shirt (usually a polo shirt, but can also be performed with oxfords and button-downs)
2. a response to a many douche bags who believe popping your collar is the ultimate form of free expression, and the epitome of cool
1. What are you tryin to look like a dickweed? Tuck your collar, dumbass!
2. Look at that asswhole pop his collar. We best be tuckin it.