Green’s Dictionary of Slang

a pest, an annoying person.

1998		R. Puxley Fresh Rabbit.
2007		N. ‘Razor’ Smith Raiders 84: I hit it off with Greg [...] but Squid was a fucking string vest.
2011		J.J. Connolly Viva La Madness 351: Right fuckin string vest ’n’ all she is [...] Come in a taxi, potless. No fuckin money.