Across social scenes — from prison yards to online marketplaces and neighborhood gossip — suddenly hearing "the feet" used as shorthand for a hookup, a debt, or a quick-money scheme feels like a code. Sometimes it’s literal: foot-related sexual interest is common enough to sustain markets (photos, massage, fetish content). At other times it’s symbolic: feet function as a low-key currency, an intimacy-stable commodity, or a conversational shortcut for vulnerability and exchange. Both meanings have converged in certain criminal and marginal subcultures, producing the curious mix you describe.