My favorite street food is actually the cut up fruit in a bag you can get from street vendors in Thailand (probably all of Asia, but I haven’t personally confirmed) and here in SoCal, but if we’re talking drunk food:
1: burritos/tacos - depends on my mood, but they are tied for first
2: pizza - REALLY subjective, given how many people make shitty pizza, but very convenient
3: chicken satay
4: chips (UK chips, not crisps)
5: Roadside thai curry - served in a plastic bag, with a secondary bag of rice. Combine the two, add some chopsticks and you don’t actually need a bowl or a place to sit down.