bonne bouche

from The Collaborative International Dictionary of English v.0.48

Bonne bouche \Bonne" bouche"\ (b[o^]n' b[oo^]sh`); pl. {Bonnes
   bouches} (b[o^]n' b[oo^]sh`). [F. bon, fem. bonne, good +
   bouche mouth.]
   A delicious morsel or mouthful; a tidbit.
   [1913 Webster]