"Thank you, control tower. Over and out." “谢谢,控制塔。通话完毕。”
"You have clearance to land." "Roger that. Over and out. See you on the ground."
"It was so good catching up with you! Have to run, over and out."
They left immediately after the party was done - no lingering or chatting, just goodbye, over and out.
See also: over adverb (FINISHED TALKING)