Green’s Dictionary of Slang

cheery adj.

drunk.

1770		Gent.’s Mag. Dec. 559/2: To express the condition of an Honest Fellow [...] under the Effects of good Fellowship, it is said that he is [...] 31. Cheary.
1894		Newcastle Courtant 18 Aug. 2/7: We may remorselessly pronounce the offender to be drunk [...] otherwise [...] that he is ‘cheery’`.