GMAFB
GMAFB definition by Slang.net
This page explains what the acronym "GMAFB" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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When someone wants you to stop messing with them or spouting nonsense, they may use GMAFB to mean "give me a friggin' break." You're most likely to encounter this acronym on social media and in web forums, while discussing controversial topics with exasperated people.
For example, if you were to log on to Twitter and post that Iron Man is the best superhero, another tweeter may respond with "GMAFB! Spider-Man is the best superhero." (And they would be right to.)