Used chiefly in British military slang meaning 'useless, of poor quality'; occasionally gradable.
Определения
(British military slang) Useless, broken, or of very poor quality. The radio was so gash it wouldn't even turn on.
(Scots, archaic) Shrewd, wise, or sagacious; talkative in a lively or garrulous way. The gash old storyteller captivated the children with his tales.