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1.
When on the internet: the arrangement of letters to form an acronym for an otherwise widely used expression.
"Like, OMG he is so cute"
"Becky, please stop using netcronyms when your talking... it's creepy"
by Element238 October 26, 2009
 
2.
Words or abbreviations that were created on the internet.
"When I exclaimed 'WTF?' he asked what that meant, and said he was not familiar with my fancy use of netcronyms."
by SerendipitousRexx October 30, 2008