bye-bye

[interj. bahy-bahy; n., adv. bahy-bahy]
interjection
1.
Informal. good-bye.
noun
2.
Baby Talk. sleep.
Idioms
3.
go bye-bye, Baby Talk.
a.
to leave; depart; go out.
b.
to go to sleep; go to bed.

Origin:
1700–10; apparently orig. nursery phrase used to lull a child to sleep, later construed as reduplicative form of by2, short for good-bye

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bye or bye-bye2
 
sentence substitute
informal (Brit) goodbye
 
bye-bye or bye-bye2
 
sentence substitute

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
They provide jobs for the duration of the project then they go bye-bye.
We see lots of similar bipolar objects, but not usually in a system that's about to go bye-bye.
Smooch your cranky old browser one last time, because it's going bye-bye.
And say bye-bye to their unlimited travels around the world.
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