Top Definition
Also meaning 'Night' or 'Black' in Latin.
Because during the night, one should be sleeping, the word Fosca is an appropriate word one can use when telling someone to go to bed.
Natasha: "Connor, go to bed"

Connor: "No"

Natasha: "Stop your whining and Fosca on"
by Mango_smoothie October 16, 2011
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