Nancy Grace -- Fart Fetish Group Vying for Video Rights

A fart fetish group has made an offer to ABC to license the rights to the infamous Nancy Grace "Dancing with the Stars" fart footage ... we repeat, a fart fetish group ... apparently, they exist.
A rep for the fetish site Clips4Sale.com tells TMZ, the company made an official offer to ABC yesterday -- writing, "After viewing and hearing Nancy Grace's alleged 'toot' after her performance on 'Dancing With The Stars,' [we] would like to acquire the rights of the three-second footage." (below)

The rep adds, "We wish to acquire this for our members of our web site who are 'Flatulophiliacs' or simply put, 'Fart Fanatics'."

It's unclear how much the clip would cost -- or if it's even for sale -- but we're confident these guys can sniff out a good deal.