frankenlang
A conlang that has components from numerous languages but is poorly put together.
[Disclaimer: I've never actually made a conlang this way yet -- this is just what I do with my *current* conlang by picking what I figure would sound like a good ancestor-lang root and "mutating" it -- so don't blame me if it produces a frankenlang :-P]
Where it comes from
Blend of Frankenstein + conlang, equivalent to franken- + -lang.
Adapted from the Wiktionary entry frankenlang (CC BY-SA 4.0).