bag on the side n.
[prob. originally related to a colostomy bag] An extension to
an established hack that is supposed to add some functionality to
the original. Usually derogatory, implying that the original was
being overextended and should have been thrown away, and the new
product is ugly, inelegant, or bloated. Also v. phrase, `to hang
a bag on the side [of]'. "C++? That's just a bag on the side of C
...." "They want me to hang a bag on the side of
the accounting system."