noun. Buzzkill; bringdown; mellow-harsher.
Also: shackle one's buzz, buzz-shackler.
Real citation: "Personally, exhaust in my lungs is a big fat buzz shackle no matter the end goal."
(Thrashador, Oct. 14, 2003, http://www.cascadeclimbers.com/threadz/printthread.php?Board=UBB7&main=256693&type=post)
Made-up citation: "My fouled-up computer isn't just unreliable and ready for the scrap heap (and the chainsaw)--it's a major league buzz shackle."