Stickpocketing
The opposite of pick-pocketing, to stick something you don't want in somebody's bag or purse. Mostly used to get rid of trash.
Person 1: How did this wrapper get in my pocket?
Person 2: You must have gotten stickpocketed.
Person 1: I hate stickpocketing people!
Person 2: You must have gotten stickpocketed.
Person 1: I hate stickpocketing people!