Short for "5 by 5" meaning "loud and clear." Also used to mean "I'm okay" per Faith (Eliza Dusku), the dark slayer on Buffy: The Vampire Slayer.
"I hear you five-by-five."

"I'm five-by-five with that."
by rich brown August 13, 2004
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"5 by" is short for "5 by 5". This is a measure on the scale of 1 to 5 of loudness and clarity of voice transmission. "5 by 5" means "loud and clear".
"I read you 5 by."
by Chrys in Houston March 13, 2004
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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.
Ex. A) – command to alpha2IC, do you read?
-command this is alpha2IC, I got you 5 by 5.

b) How’s it going?
I’m 5 by 5.
by vodka June 02, 2004
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A shortened version of the drinking term "5 shots in 5 minutes". Can also be converted to 6 in 6, 7 in 7, or if you're trying to die, 10 in 10.
I did 5 in 5 and went to Rugby... there was mostly dudes there so I did 5 in 5 again and passed the fuck out.
by JK February 08, 2005
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A pizza deal from dominos that Herman Cain decided to change slightly to 9-9-9 to come up with a catchy slogan for his campaign for his stance on tax reform
Bro 1: Hey I think Herman Cain is a great candidate this economic his 9-9-9 plan is great!
Bro 2: You know he stole that plan from Dominos 5-5-5 deal

Bro 1: Dude I love Pizza I am voting for him for sure now
Bro 2: facepalms
by Jacque Costeau November 20, 2011
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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.
by balrog May 16, 2003
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the special from domino's, which walty wants to order every single night
yo you want the 5-5-5 deal?
by walty555 January 31, 2006
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