FOSM

Accronym for Full On Stupid Mode
When it snows in Seattle, people drive in FOSM or "Full On Stupid Mode".
by donnabell November 23, 2010
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Fosm

1. fucking awesome
2. awesome in a sarcastic way
Willy K's blue plastic compass- raping whistle is fosm.
by Element 90 September 1, 2009
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