I've only heard it a few times can someone explain it to me and give me an example of its relevance. Thanks a ton.
If you want to let a pell resolve you must pass priority to your opponent and have them pass it back without responding. If you want to cast more than one spell before giving your opponent a chance to respond, you can just hold priority, cast as many things as you want and then pass priority. Your opponent then has the opportunity to respond to any/all spells on the stack before they resolve.
Usually, its not super relevant but there are some interactions where you "respond" to your own spell like playing {Infernal Tutor} then cracking a {Lion's Eye Diamond} in response to empty your hand and get the hellbent effect from the tutor. (this is used a lot in legacy combo decks)
RESOLVED
I see, thank you, that certainly puts a face to the name :).