Colombian Ice Cream Man

Talking via Skype this morning with Marina, a god awful sound came screeching through her open door. "What in the fuck is that sound?" I ask. "Ugh," sighs Marina, "there's a man outside my window honking. It's so annoying. He's like the ice cream man except he sells this horrible drink. It's basically corn kernels in milk. It's revolting." Sounds it.