Warm up 2 tbsp of coconut oil in a large skillet on medium-high heat and add the shrimps. If using frozen shrimps, make sure to thaw them beforehand. Cooking from frozen will release a lot of water. Sauté on medium-high heat for 2-3 minutes.
Juice the lime and add the juice to the shrimps. Add salt if needed - sometimes shrimps are quite flavourful without adding any salt. Cook until the lime juice has evaporated, 2-3 more minutes.
Remove from heat and stir in 1 tbsp of coconut oil. Using flavoured coconut oil, this last addition is mostly for the taste. Use immediately a filling for tacos.