Asklemmy

Garlic sauce and grated cheese

Salt

Morphine - French Fries and pepper

Hot sauce and mustard.

More fries.

Garlic.

Everything that normally goes on street corn.

Tartar sauce.

• Mac sauce
• Tartar sauce
• Truffle aioli (American style)

I guess I like mayo-based sauces

Edit: formatting

Not at the same time, but

• Soy sauce
• Cheese
• Spicy brown mustard
• Fried hot dogs and pink sauce / mayochup (aka salchipapas)
• Hot sauce

Ranch

Sriacha is what I normally put on fries. I also like the suggestion of curry sauce.

Rogan josh curry sauce (although most other curry sauces are also good). Chips and curry sauce is a really popular fast food in the UK, but the curry sauce in question is much closer to a brown sauce than it is to anything that's usually associated with the word "curry". So I make my own curry sauce and put it on instead. This does, of course, completely ruin the "fast" part of "fast food", but it is very tasty

Ranch dressing

Mayo Sriracha Mayo + sriracha Mayo+ ketchup Oregano Cheese Cheese and bacon

Honey mustard

Buffalo aioli.

But I bet nacho toppings would slap on fries.

I like barbecue sauce or A-1 steak sauce on my fries.

Sauce Remoulade. Or Sauce Mornaie (SP?)

I picked up a love of curry sauce or garlic sauce on my fries during my time living in London.

Those folks do fast food right - cheap, easy to find, and greasy.

Lots of options, but ol' reliable based on availability is mustard with a bunch of black pepper.

On a des valeurs en Belgique. Surtout sur l'assaisonnement des frites, la hauteur du col de mousse de la biere, et le caractère optionnel d'un gouvernement de plein exercice.