Sherm has absolutely nothing to do with PCP.
Sherm is a joint or simply a cigarette that has been dipped in embalming fluid (aka. formaldehyde) and left to dry. It must not be lit using an open flame lighter, but rather an automobile cigarette lighter is perfect to avoid an unwanted flame-up in one's face.
Use of sherm causes brain damage, and with prolonged use this permanent brain damage becomes increasingly serious, and the user then gets referred to as a shermhead.
Man, if you keep hittin' that sherm, you gonna melt your brains!
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A person who has smoked enough sherm to acquire serious brain damage. This does not take long to happen, and is often characterized by trembling, drooling from a slackly held-open mouth along with a rambling, mostly incoherent pattern of speach.
Oh man, that Reggie, he ain't nothing but a shermhead now; he ain't no damn good for nothing! Alls he is is a twitching drooling fool slinking around in the alleys. He melted his brains real good.
Dumb motherfu**er!
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