Eacle is a word that user "Mengxiang" made on Draw Something. It's used as gibberish, and has no meaning whatsoever, apart from being a filler word and Mengxiang's catchphrase. Pronounced "Ee-chul", "Ee-Shul" or "Ee-cul".
(Person puts scribble on board for Draw Something) Mengxiang: Hey! I bet the word is eacle!
Friend: So, Mengxiang, my socks are new!