Green’s Dictionary of Slang

beddy-bye n.

[a conscious use of a usu. juv. term]

1. (also beddy-byes) bedtime; go beddy-bye, to go to sleep.

[Aus]E. Dyson Fact’ry ’Ands 234: Booser M’Gunn, ther comp, went ter beddy-bye.
[Aus]E. Dyson ‘On a Bender’ in Benno and Some of the Push 85: So our Mr. Dickson went t’ beddy-by on a soft board lars night.
[UK]P. Gibbs Young Anarchy 59: Come on, little one. Bedibyes [OED].
A. Marshall That Island 38: Beddybyes for both of us. You’ve done a good day’s work and there’s another before you tomorrow.
[UK]Wodehouse Very Good, Jeeves! 181: And then off to beddy-bye.
[US]T. Williams Camino Real Block Sixteen: Beddy-bye, beddy-bye, darling. It’s sleepy-time down South.
[UK]K. Waterhouse Jubb (1966) 21: It’s ar par ten, Cyril! [...] Time for beddy-byes!
[US]Baker et al. CUSS 78: Beddy-bye Go to bed (not sexual).
[Aus]A. Buzo Rooted I i: Come on, beddy byes.
[US]E. Thompson Garden of Sand (1981) 319: Come back later and you and your mama can go beddy-bye together.
[SA]S. Roberts ‘The Boss’ Outside Life’s Feast 81: Time for beddy-byes!
[Aus]R.G. Barrett You Wouldn’t Be Dead for Quids (1989) 85: Now I’m going to beddy byes [...] I suggest you do the same.
[US]E. Leonard Glitz 75: She’ll put the fucking people to sleep. Couple of sets like that, they go beddy-bye.
[US]J. Lerner You Got Nothing Coming 28: Not to even mention my wake-up dosage of Prozac and then for beddy-bye, a near coma-inducing combination of Ativan and trazodone.

2. attrib. use of sense 1.

[US]J. Thompson ‘Sunrise at Midnight’ in Fireworks (1988) 153: ‘Brad, darling.’ – a sultry, beddy-bye voice.