Green’s Dictionary of Slang

F n.3

[SE fail, also used as a mark for inadequate work, or fuck! excl. (1)]

(juv.) response to someone else’s bad news.

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Axis Parents’ Guide to Teen Sl. 🌐 F = A way to show the utmost respect for someone after something bad has happened (e.g. ‘My girlfriend just dumped me,’ ‘F’).