means that, if one is unaware of an unpleasant fact or situation, one cannot be troubled by it—coined by the English poet Thomas Gray in An Ode on a Distant Prospect of Eton College, first published in 1747
UK—1879 “where the monkey put the shells”—1892 “where the monkey put the nuts”—with reference to the anus, this slang phrase expresses contemptuous rejection
Australia, 1909—to the greatest possible extent; sated with food—dolls used to have modelled wax heads with a neck shaped so that it could be sewn to a stuffed rag body
Australia, 1888—denotes a letter (i.e., a written message)—‘yabber’: as a noun, denotes speech, language, talk; as a verb, means to talk—from an aboriginal stem ‘ya’, meaning to speak
originated (1915) as the jocular beginning, destined to grip the reader’s attention, of a hypothetical novel or short story—soon (1919) came to be also used either without precise meaning or as a jocular exclamation
1947—is used to express an attitude of insularity and hostility to foreigners attributed to the British—a shortening of ‘golliwog’, the derogatory and offensive noun ‘wog’ designates a non-white person
1979—nickname given, in particular, to singer Olivia Newton-John—alludes to the type of popular music that (like a milkshake) is discarded as soon as it has been consumed
UK, 1938—old-fashioned informal British-English adjective meaning ‘in good order’, ‘fine’—origin obscure: perhaps from Hindi ‘ṭhīk hai’ (‘all right’) or from ‘the ticket’ (‘the correct thing’); or it may simply be a purely fanciful formation