When you're goin down on a girl and you use your tongue in her cum box and your nose in her clit to maximize the experience.
I was gonna go sturgeon fishing the other day and boy howdy did my nose get a wiff of that fish when I proceeded to go to town with the Bergman nose technique.
When you call someone and they dont pick up so you leave a message. The same person calls you back only you dont pick up so they leave a message. If this pattern keeps happening, You're having a Bergman conversation. Bergman conversations can be as long as people keep calling.
"He moved to Poland so everytime we called eachother the other one was sleeping, it all ended up as one long bergman conversation."