Originally derived from Donald Trump’s 2016 pre-catastrophe campaign slogan, "Make America Great Again", it eventually came to be associated with the extremism and hate that Trump, along with other power-hungry individuals, stoked.
It was heavily associated with the attempted insurrection of January 6th, when Trump unleashed a crowd of his supporters in an attempt to overthrow a lawful election and retain the office of the presidency, even as he lost.
Joe Biden eventually adopted the term as he tried to define those who chose idolatry of an authoritarian narcissist with clear signs of cognitive decline over the defining document of their country, the Constitution.