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It's a Yiddish abbreviation for Kein Ayin Hora - or in Hebrew Bli Ayin Hara. Simply stated without the evil eye; we're not discussing [something] in order to get [it] punished due to our jealousy.
See Chasam Sofer on Shabbos 147b, http://www.hebrewbooks.org/pdfpager.aspx?req=21655&st=&pgnum=80. That the names of the months come from the Babylonians, so what? The name Amraphel comes from Babylonian or some similar language, but it is darshened as having a Hebrew meaning. Same with Sancheriv and lots of other examples.
In addition to the Chasam Sofer already quoted, another source is the Shaar Yisachar in the name of "holy seforim", who addresses kabbalistically why the acronym holds despite the halacha that Iyar is written with two yuds. The Lubavitcher Rebbe explains the concept at length here.
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