Top Definition
The best damn headphones in the world. Smooth, neutral, and very musical, and with 40dB of isolation to boot!
Upon inserting the ER4S into his ears, PiccoloNamek had an intense eargasm.
#etymotic #headphone #ety #er4 #er4s #er-4s
by PiccoloNamek August 18, 2006
5 Words related to ER4S
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