Green’s Dictionary of Slang

1. of a person or situation, mad, furious, insane.

1871–82		in ‘Vocabulary of Words used by the Scottish Gypsies’ in B.M. Carew Life and Adventures n.p.: Rauge mad.
1993		I. Welsh Trainspotting 89: Ah’m nearly endin masel as Gary goes radge.
2001		I. Welsh Glue 87: Ye feel like yir jist wantin it tae go radge now, cause the fuckin tension is unbearable.
2009		R. Milward Ten Storey Love Song 115: Sometimes, Alan gets so radgy he’ll storm downstairs with a baseball bat.
2012		(con. 1980s) I. Welsh Skagboys 351: Nicksy goes fuckin radge.—Who the fark are youi callin a cunt!
2018		Observer 15 July 3/4: You radge orange bampot! Tens of thousands of Scots take to the streets [...] condeming Donald trump’s policies.
2020		G. Armstrong Young Team 36: Ma redgy teacher [...] phoned ma maw at work.

2. of an idea, a situation, foolish, absurd.

1993		I. Welsh Trainspotting 123: The quack sais that irt was too radge, her strugglin up tae the toap flight ay stairs in her auld gaff.
2009		T. Black Gutted 62: ‘It’s the new law — fines for not wearing the [seat] belts.’ [...] ‘City’s full of radge ideas’.

3. in fig. use, ‘crazy’, i.e. wonderful.

2001

I. Welsh Glue 48: That time wi choried aw that copper wire, that wis fuckin radge.