The name given to a stranger or long-term acquintance whose
real name you have no intention of ever learning.
A command given to a good buddy who has really got to calm down or else he will endanger losing the privilege of your friendship.
You: "Would you mind telling me how to get to the subway?"
Stranger: "No problem. Three blocks to the north and one to the east."
You: "Thanks Jackson."
Buddy: "Timmy's mother's funeral is at 4:00."
You: "You've told me that four times."
Buddy: "And now I'm telling you again."
You: "At ease, Jackson."