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An obsolete term for smoking a cigarette; cigarette's used to have Fiberglass filters, hence the term.
"I really need to go eat glass in my break."

"Eating glass can kill you."
by Jordan-ray July 15, 2006
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2
When you smash your own teeth in with a hammer and swallow your teeth fragments
Mother: Billy, breakfast is ready!
Billy: Just a second mom i need to finish Eating Glass!
via giphy
by bjac0 September 04, 2018
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