Hell, my local cuisiine (Tex-Mex) is a fusion cuisine, as it draws from Mexican and Anglo cooking traditions and ingredients.
Same goes for Creole cuisine in Louisiana- its a fusion of multiple different cuisines and ingredients, chief among them French, but also Spanish, Portuguese, Native American, and general Southern US cooking.
The only real utility of the word nowadays is when it’s used to describe deliberate combinations that wouldn’t normally happen due to geographic distance. Korean Tacos are one example, and so would be something like Icelandic/Indian fusion cuisine- hakarl curry anyone? (they really do need a pukey smiley)