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
But, I'm really interested in which situations you've actually done this, what reaction you wanted, and what actually happened ?
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.
I just thought he was a total dick head. We did not partner with them.
I can't imagine anyone doing that to me. Seriously, WTF.