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]