The Brief: A belfie is a butt selfie.

Bluesquiggle
DEEP DIVE

It is a picture taken of one’s own bottom. Taking a belfie can be a difficult task because your behind is, well, behind you. Belfies can be NSFW images used for sexting, or they can be posted on social media if one’s buttocks are sufficiently covered as to not violate the platform’s community guidelines.