To paraphrase professor Tom Lehrer, "Those who are willing to obtain their scholarship from Wikipedia are entitled to all the fakelore they can memorize." (This propensity for cutting and pasting, instead of sharing personal experience, is one of the most discouraging aspects of Mudcat Cafe.)   I have posted on this list for a decade as a guest (see Blue Mountain, Springfield Mountain, Morningtown Ride, etc.) Just search "Adam Miller" in "lyrics and knowledge".

My question was: in what specific year did you first hear or sing "Jingle Bells, Batman Smells." I can remember singing (in 1971 in Pacific Grove, CA):

"Jingle Bells, Batman Smells,
Robin laid an egg
The Batmobile
Lost its wheel
And The Joker got away."

I have yet to find anyone who can tell me the year prior to 1971 that these lyrics were sung. The various versions (and source locations) already posted here attest that this is a true folk song, and subject to regional and individual changes.

In 1999 my step-son taught me a variant with a different last line:
"The Joker did ballet."

I do 175+ school assemblies each year, from the Everglades to the Arctic Circle and I have found that, in 2009," Jingle Bells, Batman Smells" is as widespread and well known to American public elementary school students as "This Land is Your Land."

-Adam Miller
Folksinging.org