Use a paring knife to cut the circles in half - these will act as the cupcakes’ smile.
In a large bowl and using an electric mixer, beat together butter, sugar and milk.
Start the speed of the electric mixer on slow and gradually increase to high.
Once the ingredients are well-combined and form semi-stiff peaks, the buttercream is ready.
Divide the buttercream into 3 bowls.
Tint each bowl of buttercream with its respective color with the gel food coloring: teal, pink, and yellow.
Scoop the buttercream, one spoonful at a time and alternating colors, into your piping bag (with Wilton tip #12 attached - this will help give it its "tie dye" look.
Frost each cupcake generously, swirling upwards into a "poop emoji" shape.
Assemble each cupcake with your pre-made fondant eyes and smile.
Repeat for each cupcake, serve, and enjoy eating them!