[f. LOP v.3 + -Y.] Of the sea: Lumpy, choppy; cf. LOPPING ppl. a.3
1883. Pall Mall Gaz., 17 May, 3/2. The Channel was somewhat loppy, as usual.
1891. J. H. Pearce, Esther Pentreath, IV. ix. The sea was getting loppy in the crowded little harbour.