The text in the email, sent in October 2010 to other staffers read "New fall hat… Acorn cap with the nut still attached," a clear reference to the Association of Community Organizations for Reform Now (ACORN), which conservatives in Congress defunded in 2009 after selectively edited videos by right-wing filmmaker James O'Keefe appeared to catch organizers helping a "pimp" set up his business. Congress has voted to defund the organization several times after it has folded.
The email came into public view as part of a document dump of thousands of emails in relation to an ongoing investigation of Walker and his aides during his time as Milwaukee county executive.
The email is another example of darkly humored emails Nardelli forwarded to fellow staffers. TPM has already noted that Nardelli forwarded a racist and bizarre email where the narrator describes a nightmare of waking up black, gay, drug-addicted, disabled and HIV positive.
Here's an image of the ACORN email below: