An ear of corn grilled over charcoal and brushed with butter or a barbecue or chili sauce, sometimes dusted with chili powder. It may be chewy waxy corn rather than sweet corn. Ask for no chili (不要辣) if you want it plain.
At the night market, grilled corn was brushed with sauce, the aroma wafting everywhere.
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culture
Chinese 烤玉米 is typically brushed with soy sauce, chili, or cumin rather than butter - a sharp contrast with American or Mexican versions. It's a fixture of 撸串 (skewer-grilling) stalls and night markets from Beijing to Kunming.