When a person puts something into your pocket. It is the same as reverse pick pocketing. It is done by some advertising agencies to promote their product.
The advertisers are getting more aggressive and cheap with their put pocketing campaigns. At one time they would put a fiver in the pocket with their ads. Now they put tasteless trinkets of negative value.
Putpocketing is the art of placing one's own objects into the possession of another, either for entertainment or a charitable matter. Known by most for its reoccuring role in that low-budget flick "El No Arrepentido."
"Did you see that putpocketing fool on the 6 train? I better report him to the cops."