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A mispronunciation of "autistic", however it is not synonymous with autistic. It is normally used when someone says/does something ridiculously stupid or ignorant.
"¿Como se dice 'how do you say' en español?"
"Are you acoustic?"
by Medium Salsa December 11, 2016
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2
1) A musical instrument that is not electric
2) A musical performance that uses no electric instruments (aside from microphones and similar amplification)
1) Jimi Hendrix played an electric guitar on the song "Purple Haze", but Paul Simon played an acoustic guitar on Simon & Garfunkel's "Mrs. Robinson". Techno and dance music uses electric drums, but rock music typically sticks to acoustic drums.

2) Eric Clapton's band did an acoustic show on "Mtv Unplugged".
by Bill M. August 27, 2004
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3
a musical instrument which produces its normal sound through the sounding board and is not amplified in any way
Mumford and Sons is an Acoustic Band, that uses all Acoustic instruments.
by ilovemumfordmorethenanything September 25, 2012
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5
A word for being/acting absolutely fucking retarded or making and action resulting in you being a complete and utter dumbass.
Max is so goddamn acoustic, he needs to see a doctor...
by SavageTurkey07 February 13, 2017
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6
A word to describe Cleavage, the space in your mouth while giving a blow-job, or how tight you are.
Mmmmm that girl's got some nice acoustics!
by asmondaus March 29, 2010
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7
Seeing a pair of boobs with no bra. A naked pair of breasts.
Ralph: "Wow, Jenny sure does have nice boobs!"
Rodney: "They're not great acoustic though man. Big let downs..."
by Ahleeks March 14, 2011
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