When you are singing, humming, mouthing, or whistling a notoriously famous song, and some guy, be it a
friend or someone you
don't know at all, starts singing the words to the famous song with you timidly and awkwardly, making you
stop singing immediately. Typically the theory of "pulling a Jimmy" can be tested by walking towards the person in question, and singing "we are the champions." If the person joins you a couple words in, he is deemed to be pulling a Jimmy. **Warning** avoid singing around these
people once you have caught on to them! Or better yet.... try and see how many times in a row you can get the
fool to join you in singing gayly and then tell all of your friends!
Dude, I went downstairs and started
singing "Doe, a deer, a
female deer," and this guy named Jimmy started
singing with me and I stopped immediately because it was extremely gay. He seriously pulled a Jimmy there.