Five by five is a radio communications expression that means 'loud and clear'. One of the fives represents the S units of reception strength. The other five is a rating of the signal clarity. Five by five is a good, clear signal. The radio use of this expression goes back to the 1950s: "'All right, testing, one-two-three-four. . .' 'Five by five, Mr. Holloran!'" (Hunter, Blackboard Jungle, 1954).

The more metaphorical meaning, popularized by Faith Lehane from the television show Buffy the Vampire Slayer, wasn't recorded until the 1980s.

The use of the word is primarily used in the military, or when discussing something similar.
"'I hope everything's all right.'
'Yeah, everything is five by five'"
by 5by5 July 3, 2005
Get the five by five mug.
Loud and clear. From military erminology. Old radios had two readings. Loudness and clarity rated from 0-5. Thus five by five means literally loud and clear.
How's my signal?

Five by five.
by huddaddy September 10, 2003
Get the five by five mug.
Term meaning everything is OK.

The term comes from old radio slang. When communicating over radio, the operator would report the strength and clarity of the signal on a scale of 1 to 5 each. Therefore, if a radio operator described the signal as "five by five" it meant it was both loud and clear.
I don't use the phrase "five by five" because they use it on Buffy.
by SpeedoMask August 11, 2003
Get the five by five mug.
A term used by Faith on Buffy, to discribe a situation as ok.
I'm feeling five by five
by jayde September 15, 2004
Get the five by five mug.
a term used in the military to say everything is in order. another way of saying squared away or ship shape.
"Is everything in order?"
"Everything is five by five"
by rickysayshi January 1, 2009
Get the five by five mug.
Someone who's as tall as wide
She's definitely five by five, a real stout gal
by Tim Jilbert April 16, 2003
Get the five by five mug.