When you are eating out a girl with gum in your mouth, and it falls out and gets stuck in her muff. Its not unlike when a hobo falls asleep and wakes up to a beard full of strange things, of which gum may or may not be included. It's possible that a hobo could actually find gum in his beard after eating a girl out, but not likely. It's a sticky situation, but it does lead to shaving usually, which is a plus.
I got hobo's beard from Tom last night. fuck Tom.