carrier's fee
When you ask your friend if you can hit their vape, and they say yes, but before passing it to you they take a big hit.
You: "Hey man can I hit that vape?"
Friend with vape: "Yeah bro."
*Friend with vape takes a big hit*
Friend with vape: "Carrier's fee bro."
*Now your friend passes you the vape*
Friend with vape: "Yeah bro."
*Friend with vape takes a big hit*
Friend with vape: "Carrier's fee bro."
*Now your friend passes you the vape*