TV shows shape pop culture. Mexico City is not the exception. One of the most influential shows was "La Carabina de Ambrosio," which aired in the late 1970s and early 1980s. One of its elements was a Brazilian dancer by the name of Gina Montes. Gina would also play the assistant of Beto el Boticario, the purposefully lousy magician of the show.
Beto el Boticario would thank Gina saying "thank you" (in English) and Gina would reply "de nankyou," a mixture of de nada (you're welcome) and "thank you." Cheesey? Absolutely. Catchy? Hell yeah. De nankyou is widely popular. Don't be afraid to use it every time someone tells you "thank you" (in English).
Check the video below with patience. First, Gina Montes appears dancing as César Costa sings and then Beto el Boticario interrupts the act.