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A lonjunction (lazy conjunction) of the two words "stupid" and "spectacular". It essentially means stupidly-spectacular. It can have either a positive or negative connotation depending on it's use.
"Sometimes he doesn't think about what he's doing and still manages to win in a stuptacular way."

"Letting Rich borrow my car was a stuptacular idea... he just crashed it into a tree."
by Sl33py January 30, 2006
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