gribber, n. — Green’s Dictionary of Slang

gribber n.

[? UK dial. gribble, to remove matted wool and dung from the tails of sheep; ult. dial. gribble, a small pellet or grain]

small pieces of excrement adhering to the anal hairs.

1977

(con. 1960s) D. Goines Black Gangster (1991) 224: I’m goin’ knock all the gribbers off your ass.