phrase/ˌseɾ la ˈpoʝa/
to be awesome, extraordinary; to be the shit; to be shit hot
“Fuimos a La Floresta, que era la polla, decían que era la ciudad sin ley, pero era un sitio cojonudo.” — We went to La Floresta, which was the shit, it was said to be the lawless town, but it was an awesome place.
Literally, “to be the cock”.