tv. to make a silly error. : That was dumb. You really pulled a boner.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Idioms & Phrases
pull a boner
Make a blunder, as in I pulled an awful boner when I mentioned his ex-wife. This expression is derived from the noun bonehead, for "blockhead" or "stupid person." [Slang; early 1900s]