Step One—Bring 8 cups of salted water to boil, add frozen shrimp and for fives minutes or until pink and firm; rinse the shrimp with cool water, drain, and set aside.
Step Two—Mix red onion, celery, veggie dip, mustard, old bay, and vinegar in a large bowl; toss shrimp in dressing.
Step Three—Spoon shrimp salad onto hoagie rolls, top with lettuce, and season to taste with salt and pepper.