Lewis & Short

2. ē-rūgo, ĕre, semel factum significat, quod eructare saepius, Paul. ex Fest. p. 83, 1 Müll.
Hence, * ēructus, a, um, P. a., belched out; transf., impure, bad: vinum (with fetidum), Gell. 11, 7, 3.