Childhood cartoon characters that have suffered through major trauma and have transformed into a twisted version of themselves. There is a very short list of real BEFs, while many that are added by fans are unworthy of the title.
When after eating so many Cheetos ones forefinger and thumb become stained with a neon orange or red (if eating Flaming Hot Cheetos) powder from the chip. It can also be known as to bajeeto something from your Cheeto dusted fingers. Bajeetoed fingers are considered the scarlet letter of bad nutrition.
After eating so many Cheetosaren't you worried about getting your keyboard all bajeetoed?