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A street name for the plant Salvia Divinorum, more commonly known as Salvia. The plant has halucinagenic properties and makes you "think big," which is why its termed Big Sal. It can be smoked in a J, bong, or pipe.
"Yo, you gotta try this shit...Big Sal!"
"I tried Big Sal once.... totally fucked me up, man."
by liam b August 10, 2006
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