dub, n.¹⁰ — Green’s Dictionary of Slang

dub n.¹⁰

[SE dub, to smear, but given the lifestyle of the artists note dub n.¹]

a piece of graffito, painted on a wall or train.

2001		N. Macdonald Graffiti Subculture 209: A ‘dub’ a relatively simplistic graffiti form.
2007		Powell & Guston Forbidden Knowledge 94: dub (two-color piece) – burner (a large elaborate piece).