Heat oil in a deep-fryer or large saucepan to 350 degrees F (175 degrees C).
Cut the shrimp along the back, nearly through to the front. Stuff each shrimp with a sliver of jalapeno, then wrap with half a slice of bacon. Secure with a toothpick. Repeat with the remaining ingredients.
Cook the shrimp in batches in the hot oil until the bacon is crispy and golden brown, 2 to 3 minutes. Drain on a paper towel-lined plate before serving.