ratbag

noun

slang a despicable person

Word Origin

C20: from rat + bag

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for ratbag

Contemporary Examples

There he is smoking at Joshua Tree, milling around onstage, and palling around with his kid and dog named Ratbag.
The Yes List: A Wild Rock Star Reveals Himself
The Daily Beast
October 22, 2010

Word Origin and History for ratbag

n.

also rat-bag, "unpleasant person," 1937, from rat (n.) + bag (n.).