swinging dick

noun2

1. •
   (slang, vulgar) A man, especially one who exhibits bravado or machismo.

   • "Simple. They're all scared shitless of Polack and Artie, so they hate their guts. They know Polack is running the joint, and there ain't a swingin' dick can do a motherin' thing about it." — 1970
2. •
   (slang, vulgar) A man who is sexually very active.

   • I explained to her in my best stage whisper that I had been seriously wounded in the war, and I was now more a Hemmingwayesque embittered celibate than a swinging dick. — 2008