it’s a appointment or a “link” that a female or male make so that one and another can meet. no one but them supposed to know. on these “links” most of the timepussy and dick is exchanged.
When you're naked and want something from downstairs, and the roommate is out (but could be back at any time). You then run downstairs to "sneak a nakie."
I don't want to get dressed, but our breakfast is downstairs and I don't want the cat to get it. I'm going to sneak a nakie!
The act of going to the pub with one or more colleagues during work hours for beer. The best way to do this is to arrange a false meeting that your boss thinks you're attending while in reality you and the dude from the finance department will be downing pints at an Irish pub.