Green’s Dictionary of Slang

(W.I., Rasta) out of order, impudent, as in a rank-imposter; thus yu too renk! your behaviour is unacceptable!

1975		L. Kwesi Johnson ‘John De Crow’ in Dread Beat and Blood 41: That band of black men who acted not like she-goats but like a rank of renk cock-chickens when dealing with white wealth.
1986		R. Hewitt White Talk Black Talk 129: Renk – cheeky.
1997		‘Q’ Deadmeat 152: Liver-lipped, fish-face, renkin, rasclaatt, East End rent-ah-bwoy.
2001		(con. 1981) A. Wheatle East of Acre Lane 203: She too damn renk. Dis is de first time she swear after me! [Ibid.] 247: Five renkin’ beastman boot me up inna cell.