Don't use the term "NZ Crate Day", or Mediaworks will be after you.

NZBLOKES, a men's lifestyle website, received a letter from the media company after creating a Facebook event called NZ Crate Day 2015.

Seven people had said they were attending, four of them staff members.

But to Mediaworks this meet-up sounded too similar to National Crate Day held by their radio station The Rock FM.

In a letter, Mediaworks warned the term was "clearly associated with New Zealand" and "enjoys significant goodwill and reputation in both the National Crate Day concept and associated intellectual property".

They told the men's website to deactivate the event and to stop using the term NZ Crate Day.

NZBLOKES editor Nic Scott expressed his defeat in a statement heavy with sarcasm.

"We were eagerly tallying up the profits we were going to make but then we remembered that this was a free event, a fact that somehow got past our crack marketing team," he said.

"We did hear an alleged rumour that the word 'Grinch' and 'Killjoy' is often associated with Mediaworks but we cannot confirm nor deny such hearsay.

"Assuming we are allowed to use the words 'thanks'… Thanks for setting us straight Mediaworks.

"Good on yer mates and well played."

The letter has been published on the NZBLOKES website.

A Mediaworks lawyer confirmed the letter was legitimate, and the company had yet to comment.