The act of taking a fresh poop log , preferably firm, and carefully dropping it in your partner's underwear while they sleep. You then have the option of staying the night to experience the confusion/embarrassment the following morning.

Dude, you know how my girl keeps bitching about me peeing the bed last week? Well I put an end to that last night with a perfectly executed Ugandan Baton Drop! She woke up, ran right to the bathroom and started crying! She wouldn't come out till I left the house.