Bare Knuckle boxing is a slang term for participating in sex without using any protection, resulting in skin on skin contact. Similar to boxing without gloves.
A diplomatic gesture like a handshake or a greeting that clearly and civilly demonstrates the fierce and unrelenting determination of the part making the gesture.
As we began negotiations on the project, it started with a bare-knucklehandshake.
"Such acts are against diplomatic ethics and norms of international relations. Nothing is more reprehensible than such bare-knuckle diplomacy." - chinadaily "Bare-knuckle diplomacy shames only itself: China Daily editorial"
“Yo, the cops just raided that Korean massage joint around the corner!”
“For real??”
“Yeah, they got busted for serving out $15 bare-knuckle hand-pulls.”