Green’s Dictionary of Slang

reefed up adj.

[reefer n.1 (2)]

(US drugs) intoxicated by marijuana.

[US]‘Hal Ellson’ ‘Dangerous’ in Tell Them Nothing (1956) 42: I [...] got so reefed up I thought I was flying. [Ibid.] ‘Pretty Boy’ 122: The dance was over at two and I’m all reefed up.