Put your watermelon into a tall glass or shaker and muddle it up till its very juicy. Or you can put the watermelon into a blender or food processor to blend it up really fine. Strain the watermelon juice into a separate container.
Dip a short glass into some lime juice or run a lime wedge around the top of the glass. Dip it in the coarse salt to rim the glass.
Fill your glass with ice.
Add the tequila, triple sec and lime juice.
Then add the watermelon juice and give it a stir.
Now taste it and start making your next one cuz the first ones going to go really fast!