To conceive, concoct, or devise some idea or piece of information in a fraudulent and self-serving manner. A noun or pronoun can be used between "trump" and "up." He just trumped the evidence up for his proposal and hoped no one would investigate it. Their government has a long history of trumping up charges against citizens who express dissenting opinions.

Fraudulently conceived, concocted, or devised. Hyphenated if used before a noun. It has become clear that the so-called evidence in this report is clearly trumped up. These trumped-up charges are just an excuse for the government to silence me in jail!