A dildo long enough for two sexual partners to each insert half into their anus and have anal intercourse.
A Butt Connector could be a 20 inch dildo.
A tubular crimp-on electrical terminal dat you hook up between two wire-ends as a favor for a hot chick so dat she'll gratefully reward your repair-labors by rubbing, pressing, and/or bumping her soft warm smooth behind against yers.
If Tiffany will grant me one "butt-connector" for each crimp-type conductor-splice dat I make for her, I'll willingly re-wire her entire house and car!