let one's nuts hang

let one's nuts hang (third-person singular simple present lets one's nuts hang, present participle letting one's nuts hang, simple past and past participle let one's nuts hang)

1. (slang) To show off, or to excel.

   Synonym: flex

2. (slang) Synonym of be oneself.
3. Used other than figuratively or idiomatically: see nuts,‎ hang; to let one's scrotum hang freely.

• let one's hair down