Frankenbolt (verb):

To assemble two or more completely dissimilar and poorly integrated components in to one unit, as in the patchwork manner of Frankenstein’s Monster.

Examples

• “Reporting was an afterthought.  The developers obviously licensed a third-party component and simply Frankenbolted it in place at the last minute.”
• “Every application should stick to its core mission.  Without a core mission, scope creep always results in an application with modules Frankenbolted all over it, like some bizarre freak-show attraction.”