quedar como Cagancho en Almagro

Etymology
It refers to Joaquín Rodríguez Ortega, nicknamed Cagancho, a famous bullfighter in the 1920s, who, in, had one bullfight of such poor quality that the public threw things onto the bullpen and he had to be escorted out under police escort.

Verb

 * 1)  to make a show of oneself