to stake out or case a clothing store's dressing room, waiting for somebody to sling their pants over a partition wall in hopes of grabbing the pair, hastily sliding them on over your own and running about before eventually abandoning the pants at an undisclosed location.
"dude, i was like trying on some slacks at AE when some douche grabbed my dockers and went joy-pantsing. it bummed me out. where the popped collars at?"
What many high school students will do to fellow classmates if they decide to wear sweatpants. It is far to easy to catch the wearer of the sweatpants off-guard and pull their sweats down. Any other form of clothing on the bottom is not to be messed with.....only sweatpants.
Poor girldecided to wear her sweats today; she's probly going to get......oh, and the pantsing begins.