high on one's own supply adjective2 •(of a drug dealer) Using the drugs which one sells, especially to excess. •(figurative) Assigning too much credibility to exaggerated favorable descriptions of one's character, achievements, or prospects; intoxicated by one's own braggadocio; enamored with one's own overvalued public image.Trump […] seems to have gotten high on his own supply — he actually seems to believe the bizarre conspiracy theories his supporters drum up to excuse his actions. — 2019
