chronic
1. adjective
1
constant; bad, objectionable, severe, unpleasant. From the conventional medical sense UK, 1860.
2
very good US, 1998
2. noun
1
potent marijuana. A word popularised in hip-hop usage. 'The Chronic' by Dr Dre (1992) is one of the biggest-selling rap albums of all time US, 1993.
2
marijuana mixed with crack cocaine US, 1998