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Prepare Watermelon Juice: Muddle the watermelon chunks in a cocktail shaker until fully juiced. Alternatively, blend and strain for a smoother texture.
 
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Combine Ingredients: Add the vodka, cranberry juice, Triple Sec, and lime juice to the shaker with the watermelon juice. Add ice.
 
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Shake It Up: Shake vigorously for 15–20 seconds, until the mixture is well-chilled.
 
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Strain and Serve: Double strain the cocktail into a chilled martini or coupe glass for a smooth, pulp-free drink.
 
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Garnish and Enjoy: Garnish with a small watermelon slice or a twist of lime.