adjective
Full of merriment and high spirits; jovial; joyous; merry.
(colloquial, dated) Splendid, excellent, pleasant.
(informal) Drunk.
noun
(UK, often humorous) A pleasure trip or excursion; especially, an expenses-paid or unnecessary one.
(slang, dated) A marine in the English navy.
(slang, archaic) A word of praise, or favorable notice.
Ellipsis of jolly boat.
adverb
(British, dated) Very, extremely.
verb
(transitive) To amuse or divert.
(transitive, informal, archaic) To praise or talk up.