Battlefield V is the 2018 World War II shooter from DICE, where faction voice lines play in the soldiers own language during matches. German troops call for and thank the medic in German, which is where this ahh danke Doktor line fits, heard around heals and revives. Short foreign language reactions like this travel well on soundboards and in edits because the meaning is clear from tone alone, and Battlefield players reuse it outside the game as a playful way to thank anyone who helps.