Jonathan Majors and Meagan Good aren't acting in a Narcos reboot -- despite the optics -- the Hollywood stars were in Colombia last weekend for buddy Jas Mathur's birthday bash ... where they chilled with Pablo Escobar's doppelganger!
35-year-old Majors and 43-year-old Good flew down to Escobar's home country last weekend for Mathur -- AKA Limitless -- 40th trip around the sun ... where dozens of Jas' friends celebrated his birthday in Medellín.