Guy 2: Yeah I have 2, One is Electric, One is Acoustic
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Guy 1: Look at this Osaka meme
it is said when someone does something really stupid. you call someone acoustic then they do something that's so stupid.
idiot - I love windows so much because its so hard to use. that's a good thing.
smart person with a brain - dude are you acoustic? wow your so dumb and macOS is better
idiot - what?
smart person- yea
The meaning of "acoustic" in slang is another way of saying autistic, without actually saying the word. So when someone asks if a person is "acoustic" they're asked if that person is autistic. Or if someone says "You're so acoustic" they mean "You're so autistic/weird" Or in other words, sped.
"Is Samuel acoustic?"
"He acts so acoustic"
"You're so acoustic"