To mindlessly and/or carelessly copy and paste important information from one report to another without making sure that the information is actually relevant to where it's being put, or in the case of spreadsheets or other financials, not bothering to ensure that the totals continue to match or balance.
A clerk is being reprimanded in his manager's office:
Boss: You're going to have to pay closer attention to how you update our reports.
Employee: What are you talking about?
Boss: This. It's like you were someplace else when you did this control-slop and pasted last week's data into this week's report and never bothered to check it.