"Charizard" in the context of a porn video tag is likely a reference to the popular Pokémon character, which is a fire-type, Dragon-type Pokémon. This could be used as a fetish or kink tag for those who have an interest in anime, fantasy, or specific Pokémon characters incorporated into their adult content viewing experience. It does not have any explicit meaning related to porn video content but represents the character's presence as a theme or preference.