GUFN
GUFN definition by Slang.net
This page explains what the acronym "GUFN" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Someone who is GUFN is "grounded until further notice." So don't expect to see them again anytime soon ...
What does grounded mean?
In this context, grounded means to be barred from leaving the house for social activities. Just as pilots can be grounded and not allowed to fly, children can be grounded and not allowed to go out and have fun.