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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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FOSM

Accronym for Full On Stupid Mode

When it snows in Seattle, people drive in FOSM or "Full On Stupid Mode".

by donnabell November 26, 2010

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