Green’s Dictionary of Slang

pleasant adj.

drunk, tipsy.

1841		D. Boucicault London Assurance in London Assurance and other Victorian Comedies (2001) Act IV: I am afraid they are getting too pleasant to be agreeable.
1853		‘Cuthbert Bede’ Adventures of Mr Verdant Green (1982) I 36: Mr Bouncer had made hisself so pleasant, that he’d been and got the porter out o’bed, and corked his face dreadful.
1873		‘Cuthbert Bede’ Little Mr. Bouncer 12: He’s not had no sober-water this morning, and I’m not aware as he were pleasant last night.