Scottish National Dictionary (1700–)
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First published 1960 (SND Vol. V).
This entry has not been updated since then but may contain minor corrections and revisions.
JAFS, v.1, n. Also jaffse. [tʃɑfs]
I. v. To make a loud noise with the jaws when eating, gen. accompanied by loud breathing through the nose; to make greedy snaps with the mouth in eating (I.Sc. 1866 Edm. Gl., jaffse; Sh. 1908 Jak. (1928), jafs, Sh. 1959).
II. n. A greedy snap with the mouth in eating (Sh. 1908 Jak. (1928), Sh. 1959).
[Norw. dial. kjafsa, to eat voraciously like a dog, O.N. kjǫptr, the chops.]