[Nevadaref]

Rut makes a good point that terms and words mean different things to different folks. Unfortunately, one cannot know the jargon of a particular group unless the individual is either part of that group or studies it.
The default is the standard definition, and yes, even those do change as he points out. Language is an evolving device of communication.
In many cases, what someone says is not what is understood. When that happens we must identify which party is at fault for the miscommunication. Should we point the finger at the one using the nonstandard definition of a term or the one using it out of its expected context within a particular social circle?