That's a whole line is a phrase used when someone tells you something so random but when you really think about it the answer is confusing, or not there
Friend: Hey, how do you hear yourself when you think in your head if you're not making any sounds?
You: That's a whole line right there
Morse Code: A smoking term; the action of repeatedly tapping the side hole of a bowl while inhaling to both keep the weed lit and ventilated for a better high
You: Hey its my first time smoking how do I hit it?
Friend: Yo let me do it for you, ill Morse Code it