When a group of angry lesbians take over a corner or area of a club. With the specific aim of muffing it up.
Its like a Muller corner but with muff, hopefully no crunch maybe a bit of fruit and a lot of yoghurt.
Hannah: Check out the group in the corner dining on their lady cakes.
Tom: Oh my god!! Such a Muff Corner!
Frankie: What the Shell!!