Slice the watermelon into triangles. Use a knife to cut a strip in the rind of each triangle and insert a popsicle stick.
Arrange the watermelon triangles on a tray. Squeeze the juice of one lime over the watermelon. Flip the triangles and drizzle tequila over them. Sprinkle lime zest on top.
Place the tray in the freezer and let it freeze for 30 minutes.
Take out the frozen watermelon popsicles and enjoy!