5 by 5

[Little_Girl]

This is an old aeronautical radio term. Radio signal strength and clarity were measured on a scale of 1 to 5. Today the term Loud and Clear is preferred to 5 by 5.

In slang use 5 by 5 means things are well, good, or as expected.

[Jessica]

Respective rating used to report ballpark signal strength and clarity of a transmission. So a 5 by 1 means a strong signal is present, but what is saying cannot be understood. 1 by 5 means you can understand them, but a signal is barely coming in. 5 by 5 is ideal for both counts.
Can also be used nowadays to mean one is doing well.

[Rihanna]

In the Pipe, 5 by 5
This is a specific reference to one of several conditions.
1: You have entered a large concrete pipe and everything is ok
2: You are piloting a starship into the atmosphere of a planet and are in the perfect trajectory pipe. Everything is ok.
3: You have entered a vagina and everything is ok.
4: You have entered a vagina and its dimensions are approximately 5 by 5

[Couch Potatoe]

To be in a content state of being. To be fine

[Becky]

Also refers to level of orientation in a neurological/psychiatric exam. Five by five means that you are oriented to (your)name, place (where you are), time, day/date, and year/current President. A way of saying that youre alright, everythings cool.

[PussyCat]

A small one room economy flat.

[Justin Bieber]

a short, fat dude