Did you perhaps mean kazoo?
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“Before i married, I lived in a rented home and rarely had two brass razoos to rub together ... but what colour do you think my furnishings were?”
“For example, I'd love to have some of those old scamsters from the Quarter re-employed at a casino exhibition booth, demonstrating various razoos like "cajun bingo".”
These user-created lists contain the word ‘razoos’.
Please note these aren't all *strictly* testicle terms, but include other... uh... nearby parts.
Also, an interesting quote can be found here, and another on...
Looking for tweets for razoos.