1905 Goshen (Indiana) Daily Democrat 10 Aug. The present writer has conversed with half a dozen men of culture and position, three of whom ‘yah'd’, while the other three ‘yepped’.

1926 Spectator 6 Nov. 791/1 We shall presently find our people ‘yepping’ everywhere.

2001 Daily Tel. (Sydney) (Nexis) 28 Sept. (Sport section) 130 This time Buderus yepped and yepped into the mouthpiece and hung up.

1883 Xenia (Ohio) Daily Gaz. 31 Mar. ‘Yep,’ said Uncle Rube, shutting one eye and taking a comprehensive glance of the two youths with the other.

1891 Harper's Mag. Nov. 970 He gently and peacefully murmured, ‘Yep’.

1897 R. Kipling Captains Courageous x. 222 ‘Like Lorry Tuck?’ Harvey put in. ‘Yep.’

1907 J. W. Schultz My Life as Indian xxv. 284 ‘You must cut your hair.’ ‘Yep.’..‘An' quit gamblin.’ ‘Yep.’

1962 E. Birney Sel. Poems (1966) iv. 99 Yep ain't nothin we kin do.

1979 R. Jaffe Class Reunion (1980) i. vi. 74 ‘Oh? You got a new car?’..‘Yep... Look out the window.’

2015 Glamour Nov. 168/2 Yep, hair perfume. It's totally a thing. And we love it.

1896 A. Cahan Yekl ii. 34 ‘You vont a job?’ or, again, ‘Is it hot anawff for you?’ To all of which Jake returned an invariable ‘Yep!’ each time resuming his bored mien.

1914 N. Amer. Rev. Feb. 261 Even an uncultivated judge would be likely to reprove anyone who should substitute a..‘yep’..for the ‘yes’..with which even the most uncouth know enough to respond in court.

1926 J. Galsworthy in Scribner's Mag. Dec. 581/1 Their ‘Yeahs!’ and their ‘Yeps!’ Americans no longer said ‘Yes’ it seemed!

1967 Listener 19 Jan. 96/3 ‘Would you like a cigarette?’ I got a typically aggressive ‘Yep’.

2010 Sunday Times (Nexis) 22 Aug. (Mag.) Almost all the questions I asked were answered with nothing more than yeps or nopes.

1690 J. Dryden Don Sebastian i. i. 17 To your paces Villain, amble, trot, and gallop:—Quick, about there.—Yeap.

1869 J. C. Atkinson Peacock's Gloss. Dial. Hundred of Lonsdale Yep! a word of command to horses.