Brian 'Head' Welch just gave FedEx an unwanted plug ... if you pop meth in an envelope you're guaranteed next day delivery.
The Korn guitarist went on Matt Weiss and Theo Von's "Allegedly" podcast to talk about his life as a rockstar and how he's shocked to still be alive.
Welch -- who's now sober -- confessed that he once shipped himself three 8-balls of meth from California to Germany.
The entire podcast will be released on iTunes Tuesday.
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