cotton alley

The title of the bonus chapter/world in Super Meat Boy. The chapter themes itself around femininity, as you play Bandage Girl with certain level names eluding to the theme as well.

The chapter title likely refers to tampons (often made of cotton) being inserted into an "alley", thus making a vagina the "cotton alley".

G*mer: I JUST BEAT COTTON ALLEY DARK WORLD DEATHLESS!!!

Normal person: Go outside virgin