A massive burger made by putting together to Burger King 'Quad-Stackers' on to a single bun.
I can't believe you ate that entire octostacker!
by bobbusnewbrick January 12, 2009
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When you eat a hamburger with 8 layers of meat.
*walk into burger king* "id like an octostack"
by Samgoodyear January 14, 2009
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