nonce-wd. [f. BUM sb.1]
1. trans. To pad or make a projection about the posteriors.
1605. Camden, Rem. (1637), 197. Women bummed themselves with foxe tailes under their garments.
2. intr. To project, form a protuberance.
1633. Rowley, Match at Midn., I. i. in Hazl., Dodsley, XIII. 8. What have you bumming out there, goodman File?