Fernando Tatis Jr. got Petco Park rockin' with an early home run Tuesday night -- but Tom DeLonge made sure the Padres party kept on going later in the evening ... when he led the crowd in a legendary rendition of a Blink-182 classic.
It all went down during Game 3 of San Diego's National League Division Series with the Dodgers ... when the Padres were trying to take a commanding 2-1 series lead over their hated rival.