When an opinion is deconstructed to such a fundamental level that the person/group holding the point of view have to contradict the core idea and in doing so have their mind changed.
When a female partner has clammy or "sweat soaked hands" and gives you a hand job.
After Michel reached into Dan's pants, Dan looked Michel dead in the eye and said, "Yo, wash your hands first, I didn't think you were going to clam the johnny."
To do the johnny is to 'keep walking', as per the slogan used by the iconic Johnny Walker whisky brands. The phrase refers to the act of continuing to walk a distance that would be otherwise traversed via a more efficient means, with the journey being the product of (often drunken) time mismanagement.
1: "bro, i dont think there is another train...the next bus is in 3 hours.."
2: "fuck, looks like we are going to have to do the johnny, and keep walking."