When somebody does not understand what you are saying as a result of your use of slang.
"Got a ripper gobby yesty arvo. Fair dinkum"

"I'm struggling to understand you due to the slanguage barrier."
by D-Train49 March 11, 2013
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Confusing out-of-towners or visitors when using slang from your local region.
Moving to a new city and making friends can be difficult if there's a slanguage barrier.
by hannsomejonny September 9, 2016
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When a non-native speaker fails to grip the slang implications of something that would otherwise seem reasonable to say/wear on clothing. You know it when you see it.
"That kid's shirt says Dream Hum on the back…"
"slanguage barrier"
by DJPajamas November 3, 2013
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