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Blunn describes a thing or situation that is somewhere between just ordinary blah or dull, and truly shitty and horrible. Blunness carries a little more weight and negative connotation than "boring" or "meh". Something that's blunn is lamer than lame, but not yet really truly awful.
"My physics professor told us that anything he ever mentions might be on the final and the textbook is 3 inches thick. That class is so blunn it's not even funny.

"John's 21st birthday party was supposed to be a major 3-keg blowout, but it turned out totally blunn. Only 7 people showed up, no girls, and nobody had enough money for beer."
by Kiff L-S January 19, 2013
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