yoop, yoick, yowp noun currency five shillings, a crown or half a crown
20; historical.
Compare bull etymology: pre-decimalisation (1971) a coin five shillings or two shillings and sixpence respectively; appears to only be used by Scots Travellers; attested by Galloway and Perthshire and Argyleshire Tinkler-Gypsies and BS in TDITA; also collected by EMcC/PS