The act of gerbiling, according to the Internet, is simple. In most
instances, it involves a tube up the ass, followed by a gerbil up that
tube. Some accounts suggest that the gerbil should be declawed as a
safety precaution, but the main gist is to have the gerbil burrowing around one's anus long enough to bring about sexual pleasure. One might
lure the gerbil up the tube with a piece of cheese, or, inversely, light
a flame under the funnel to send the gerbil scurrying.
-Readability/The AWL