Given the context of the rest of the phrase, the audio engineering usage might be the most relevant interpretation here.
In many Role-Playing Games (RPGs) or tactical shooters, reaching level 45 unlocks end-game gear, special perks, or specific regional quests. "The Galician" might refer to a specific character build, an in-game faction, or a player pseudonym famous within a community. fu10 the galician gotta 45 link