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1. vulgar slang The testicles. I kicked the mugger in the nads and grabbed my wallet back. He grabbed his nads in a lewd gesture to the crowd.
2. vulgar slang Confidence, self-esteem, motivation, etc. Often but not always said of a man. You've got nads standing up to them like that, man. He doesn't have the nads to try a plan that bold.
n. the testicles. (see also nards.) He got hit in the nads in the football game.