SFB
SFB definition by Slang.net - The Slang Dictionary
This page explains what the acronym "SFB" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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SFB stands for "S*** for brains," which is a way to describe someone who is not very smart. The acronym is most often seen online and in text messages.
It is typically used in reaction to someone saying or doing something very stupid. Or it may be seen posted on social media with an image or video of someone doing something idiotic, like jumping off of a cliff or almost blowing up a body part with fireworks.