Green’s Dictionary of Slang

an extreme derog. term.

1957		C. MacInnes City of Spades (1964) 98: ‘You ras-clot man — you’s wasted.’ ‘These bumble-clot men — these pussy-clots.’.
1978		Radical Alliance of Poets and Players Dem a Come n.p.: To put it as best as l can l was called a Raas claat. JUDGE: PC Bartholomew — what is a Raas claat? PC: With my experience of working in the deprived areas — to my knowledge it means or has something to do with the menstruation cycle.
1986		R. Hewitt White Talk Black Talk 38: There was a crowd of black geezers roamin’ about town [...] talkin’ a load of shit, carryin’ knives, goin’ ‘You rassclaht!’.
1990		J. Healy Streets Above Us (1991) 89: Sam, you frightened of that rass-cloth?
1991		L.E. Adams Jam. Patois 59: Ras or Raas: backside, rump; a common curse is to rass! or rass clot!
2006		G. Malkani Londonstani (2007) 15: Ras clat, fuckin useless.
2008		J. Lisowski Looking for Lauren 19: ‘Raas Claat!’ A man with dreadlocks shouted as I walked past. ‘Huh? What?’ ‘Raas Claat!’ he repeated, sucking his teeth.
2010		C. Cooper in Olaniyan & Sweet (eds) African Diaspora and the Disciplines 290: It is this embodied knowledge of female authority that is invoked in the actof vocing the damning ‘bad’ word: pussy hole, blood claat [cloth], raas claat, bombo claat.