4chumbler is the combined names of 4chan and Tumblr and it is used to describe the 'shipping' of the 4chan Anonymous man (a green, faceless man in a snazzy suit) and a Tumblr hipster (a teen girl with blue hair, hipster glasses and a tumblr icon hairclip) after 4chan anons threatened to invade and spam Tumblr blogs.
The fuck is 4chumblr?
by potterology- February 25, 2011