I hope ye are yaup, for ye have a lang day's wark before ye.
"Hold your yaup, you youngster you," roared the old man in reply.
c.1300, yolpen, probably echoic variant of yelpen (see yelp). Related: Yawped; yawping. The noun, in reference to speech, is recorded from 1835, now used chiefly with conscious echo of Whitman.