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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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