swash someone's buckle

verb4

1. •
   [with oneself] To behave or feel in a swashbuckling manner.

   • If a man is going to play the swashbuckler, I like to see him able to swash his buckle. — 1912
2. •
   A nonce verb

   • You just stay here and swash your buckle. — 1983
3. •
   To subdue or trounce.

   • The next time we fence, I'll swash your buckle, lady. — 1985
4. •
   (euphemistic) To have sex

   • I still wouldn't mind having my buckle swashed by a nice taut blond. — 2009