Burdock is any of a group of biennial thistles in the genus Arctium, family Asteraceae.
The prickly heads of these plants are noted for easily catching on to fur and clothing, thus providing an excellent mechanism for seed dispersal. Burrs cause local irritation and can possibly cause intestinal hairballs in pets. However, most animals avoid ingesting these plants.
When you surprise a "friend" sitting on the couch by hiding in the near by closet with your male friends masturbating. once you and your friends reach they're peaks they run out and surprise them by "blowing they're loads" all over the unsuspecting victim on the couch creating a sprinkler effect.