Vulgar Slang Very tough and courageous, often recklessly or presumptuously so.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "ballsy" in a sentence
"I’d almost call it ballsy if the ABC execs didn’t just blindly lap it up as a self-contained storyline with lots of skin, lots of needless re-capping of main story arc points, and (gulp!) a treasure … which you know they did."
"When was the last time a Dem candidate was referred to as ballsy?"
"The festival also gives prizes to to those who have made the news for being "ballsy"."