Definitions for trumped-up
Random House Webster's College Dictionary
spuriously devised; fraudulent; fabricated:
arrested on some trumped-up charge.
Origin of trumped-up:
concocted with intent to deceive
Faked, fabricated or falsely manufactured. Usually in the phrase trumped-up charges referring to legal accusation made for illegitimate reasons.
Origin: From the past participle form of the phrasal verb to trump up