The term is an acronym for Private Branch eXchange. A PBX, sometimes known as a telephone switch or phone switching device, is a system that connects office telephone extensions with the public network.
Our company uses an IP PBX as a communication server.
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A polymer-bonded explosive, also called PBX or plastic-bonded explosive, is an explosive material in which explosive powder is bound together in a matrix using small quantities (typically 5–10% by weight) of a synthetic polymer ("plastic"). Note that despite the word "plastic", polymer-bonded explosives are not hand malleable after curing, and hence are not a form of plastic explosive.

PBXs are normally used for explosive materials which are not easily meltable to cast or which are otherwise hard to form.
JACK: So, we plant some PBX, jump ship, then blow it.

THOR: What is PBX?

TEAL'C: An explosive.
by Hans Olo May 5, 2009
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A pbx is a eskimo canadian who lives under a rock in canada and hates going outside. Most likely a doug/regal lover who likes to call people cotton farmers. Also is addicted to the NBA even though canadian.
pbx why are you doug lover
sovietz you blackie
by Sovietz99 July 7, 2021
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A hybrid sexual position that uses the base of the cleveland steamer but interjects .5 cups of peanut butter
It's my birthday tonight, maybe my wife will let me try the pbx sitter.
by Johnson Hose June 28, 2008
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Playboy Xclusive is the wave will always be the wave. Coming Straight Out of The Berry Cuh.
PLayboy the wave ya herd. PBX always on top.
by PlayBoy The Wave January 28, 2022
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