To rump any one; to turn the back to him: an evolution sometimes used at court. Rump and a dozen; a rump of beef and a dozen of claret; an Irish wager, called also buttock and trimmings. Rump and kidney men; fiddlers that play at feasts, fairs, weddings, &c. and live chiefly on the remnants.
RUMP
Meaning of RUMP in English
Slang English vocab. Английский сленговый словарь. 2012