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1) An old-fashioned telecommunications device that makes digitally-encoded sounds to be received and interpreted through a telephone handset. The acoustic coupler had two rubber cups that fitted the "mouthpiece" and "earpiece of an old-fashioned phone "receiver".

2) A person who makes a lot of noise during sex.
"My phone won't fit the rubber cups on this acoustic coupler"

"Britney had her boyfriend round overnight and I couldn't get to sleep. She's such an acoustic coupler"
by Terroin April 06, 2014
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