Green’s Dictionary of Slang

1. (also radgeboy, radgehead) a psychotic.

1993		I. Welsh Trainspotting 3: Ah wanted the radge tae jist fuck off ootay ma visage.
2001		OnLine Dict. of Playground Sl. 🌐 radgie gadgie, radgeheed n. Someone prone to flying off the handle; unstable or crazed.
2012		(con. 1980s) I. Welsh Skagboys 16: These radges are taking nae prisoners.
2012		(con. 1980s) I. Welsh Skagboys 144: Aw that cack about [...] whae’s battered whae, n whae’s been a radgeboy oan the peeve.
2013		T. Black Ringer [ebook] n.p.: Wee radge can go swivel.
2018		I. Welsh Dead Man’s Trousers 67: A radge or a wideo gien ye hassle.

2. a temper tantrum.

2001

OnLine Dict. of Playground Sl. 🌐 radge n. a fit, getting angry or lashing out.