Nicaraguans call themselves 'pinoleros' after this drink, and the word turns up in popular songs as shorthand for being Nicaraguan.
Pinolillo is made by toasting corn and cacao together, grinding them into a fine powder with spices, then mixing that powder with water or milk into an earthy, slightly bitter drink. It's sold from street stalls and markets across Nicaragua, drunk cold as an everyday refresher rather than reserved for special occasions.