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1.
From Richard Adam's book Watership Down - it's a word that's part of the rabbit language Lapine - it means to go above ground to eat.
I didn't silflay with the rest of the warren this morning - I'll go tonight.
by Captain 12 pack January 11, 2007
 
2.
To eat outside. Combination of the words "Flay" and "Sil." Flay means food, and Sil means out.
Hey, John. We should go silflay.
by Porphyric November 09, 2008