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An extremely loud sound. Its like balls deep... but in your ear.
"Dude, that concert last night was balls loud!"

"Gabriel plays balls loud on his trombone."

"That airplane is balls loud."
by BCore June 10, 2008
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Jul 28 Word of the Day
to sport a boner, fly the sail at full mass, rock hard, etc.
"I had a lot of cartoon characters that used to get me sexually aroused as a kid... The female reindeer from the Rudolph claymation series, when I was in preschool, I used to be bricked up watching that shit." -Jack Harlow
by real_philly February 11, 2020
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