When talking to someone, you step up to them and grab their arm.
Then you force them to walk around with you, while you have their arm. Total attention.
Example: https://makeagif.com/i/3Bfhx7
Not sure where you're writing from geographically, professionally or culturally but I can't imagine doing this to anyone.
In a professional environment, grabbing someone's arm and leading them around by it seems like an incredibly inappropriate breach of that person's personal space.
LOL. Literally. Do people do this? I gotta try this with my wife - on the one hand she's going to smack me but on the other hand I'll get a serious laugh out of the experience.
I was once meeting some potential partners. The big tall guy did some kind of power handshake on me using both hands and exerting an uncomfortable amount of pressure.
I just thought he was a total dick head. We did not partner with them.
But, I'm really interested in which situations you've actually done this, what reaction you wanted, and what actually happened ?