The "-oid" attachment to common words has been around for quite some time, but since it's basically a "slang" thing the definitions are rather loose.

A very early usage that I encountered, probably 40 or more years ago, was the term "factoid," used to denote a "fragment" of "information" with possibly/probably dubious usefulness.

As I've seen the appendage applied, it often implies:

1. Fragmented/fragmental association (with the subject at hand, or from which it derives).
2. Dubious usefulness/validity/applicability.
3. Having a "life of it's own, in some sense.

Usable both for nouns and adjectives, but usually attached to an "object" in noun sense. Often mildly deprecating, but increased use has diluted the impact of the derogatory connotations.

It may, perhaps, have made it's way into some of the slang dictionaries, in which case it's usefulness as a slang term is no longer truly viable for those who created it.

John