subs. phr. (common).Bad beer, SWIPES (q.v.); hence indifferent LAP (q.v.) of any kind: cf. WHIP-BELLY-VENGEANCE.
1861. T. HUGHES, Tom Brown at Oxford, xli. I thought you wouldnt appreciate the widows tap, said East, watching him with a grin: regular WHISTLE-BELLY VENGEANCE, and no mistake.