[f. TIFF sb.3 + -Y.] Given to tiffs; in a tiff; pettish, ill-humored; faddy.

1

1810.  Splendid Follies, II. 126. The old lady felt quite tiffy, and mumbled her roll in silence.

2

1883.  Bread-Winners (1884), 27. She’s too tiffy for poor folks like us.

3