high on one's own supply

English

Etymology

From a scene in the film Scarface (1983), in which drug dealer Tony Montana (Al Pacino) is mocked for excessively consuming cocaine from his own inventory.

1983, Oliver Stone, Scarface, spoken by Elvira Hancock (Michelle Pfeiffer):

Elvira Hancock: Lesson number two: Don't get high on your own supply.

Adjective

high on one's own supply (not comparable)

1. (literally) (of a drug dealer) Using the drugs which one sells, especially to excess.
2. (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.
   • 2013 June 10, Jonathan Owen, James Cameron: 'Don't get high on your own supply', Independent (UK) (retrieved 28 July 2021):

     The relentless pursuit of realising his imagination on the big screen has come at a personal cost. […] The director admits he used to play up to the "image of what a film-maker was supposed to be. […] [D]on't get seduced by your own stuff. Don't get high on your own supply."

   • 2019 November 10, Paul Krugman, Luckily, Trump Is an Unstable Non-Genius, New York Times (retrieved 28 July 2021):

     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.

   • 2020 November 4, Hank Stuever, Election night TV was high anxiety, flat comedy, Washington Post (retrieved 28 July 2021):

     Tapper reminded viewers that there had been a lot of magical thinking lately on the part of Democrats and liberal pundits, who spent too much time entertaining pie-in-the-sky dreams […] imagining a landslide victory for Biden. "As they say, 'You can’t get high on your own supply,'" Tapper zinged.