1) A term used to attract people to acoustic shows because it seems some how more enticing.
2) A common mis-spelling of the word 'acoustic' refering to the acoustic guitar or acoustic type of music.
Myself: "Brahh, did you check out that sweet acoustic session of City & Colour?"
Dave: "No dude, I think it was a-cew-stick!"
Person3: "accoustic!!"
Myself: "Shmurrmurrmerr"