It got its name from the song Mr. Bojangles:
"I knew a man Bojangles and he danced for you ..."
Check out the Bojangles on that guy!
One could also just start singing the song to alert their friends without necessarily pointing out or bringing attention to the fact you're checking out someone's package.
Posting voluminous amounts of the music of The Bangles to a person's Facebook wall in a bombardment like manner, similar to a Steamy Collins. Songs typically should include "Walking Down Your Street" or "In Your Room", among others. Similar to a Steamy Collins.