Add mayonnaise, sour cream, garlic, gochujang, and salt to a medium sized mixing bowl.
Mix it well using a small wire whisk.
Check for salt and add more if needed.
Chill the sauce for 2 hours in the fridge and serve.
Video
Notes
You can adjust the quantity of Gochujang as per the spice level you need.If you can get your hands on Korean mayo or Kewpie Japanese mayonnaise, it complements the Gochujang well. They might be available in the Asian section of the grocery stores. But if you do not get it, you can use the regular American mayo for this sauce. You can even try using an eggless mayonnaise for an egg-free version.