The abbreviation for 'rat
bastard', similar in context to mofo, or mother fucker. The
s in bastard was originally included in the term, making 'rat bast', but the letter quickly quiesced because of the rhyme scheme rat bat offered. The phrase has a tendency to be overused by the uneducated.
(adj) mother fuck'n, fuck'n,
mug'n
being dirty, scheming, or treacherous, trifle'n, cantankerous
(n) rat bastard, mother fucker, fucker,
mug
of being no good, a scoundrel or shithead