I have just encountered this word on a news entitled " 'Unfriend' or 'Defriend?' Facebook Fans Debate", and here is the sentence:
"No, unfriend is definitely more lexy," wrote another commenter. (link: http://abcnews.go.com/Technology/AheadoftheCurve/unfriend-defriend-facebook-fans-debate/story?id=9106240)
Actually I have looked for the definition of the word "lexy" online ( that's the only tool I have now) and Urban Dictionary was the only one I found mentioning this, but the definitions given in this dictionary doesn't seem fit the sentence well (except for the second one, which seems to fit the sentence above most and the writer of which wrote that it is a combination of "lush+sexy", whereby it means "highly fashionable"), so I would like to ask you.