160 calories per 2 tbsp. See nutrition information for fat and saturated fat content. Estd 1869. Heinz mayomust combines the delicious taste of yellow mustard, mayonnaise and a special blend of spices. www.Heinzmayochup.com. SmartLabel. Scan for more information. Questions or comments? Call 1-800-255-5750. Visit us at: www.Heinzmayochup.com. Introducing the latest mashup from Heinz: Mayomust! Inspired by the infamous Mayochup, Mayomust is the delicious taste of Heinz Mayonnaise + Heinz Yellow Mustard (with a special blend of spices).