Green’s Dictionary of Slang

1. very drunk.

1912		Bulletin (Sydney) 24 Oct. 16/2: Five days later Spence came home more rolling than before.
1936		D. Parker ‘From the Diary of a New York Lady’ in Parker (1943) 139: Everybody absolutely rolling.
1978		J. Hewitt Rain Dance n.p.: And when he came back, rolling, from the town [BS].

2. under the influence of MDMA.

2002

Teen Lingo: The Source for Youth Ministry 🌐 rollin’ [...] 2. Term used when under the influence of Ecstasy (X). ‘Hey are you rollin?’’.