(in no way affiliated with #MacGruber which is also out in theaters today) #Shrek Exposed!: http://shrekexposed.com/- The Lonely Island
Shrek's been doing some terrorist bombing:
So that was the Lonely Island's tweet (and they have a similar blog post). This basically means that Joni or Jorma wanted to comically downplay MacGruber's biggest film competition (sort of how Austin Powers 2 trailer masterfully told you to watch Star Wars), which is Shrek 4.
Kind of amusing...
Shrek's offensive haircut: