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To talk or chant in the reggae music mode: not exactly toasting, it was a kind of primitive rapping, consisting mainly of new slang words and an occasional joke (1970s+ Musicians)
1. Any completely inoperable system or component, especially one that has just crashed and burned: "Uh, oh ... I think the serial board is toast."
2. To cause a system to crash accidentally, especially in a manner that requires manual rebooting. "Rick just toasted the firewall machine again."