It is a mixture of the word "hi" and "hello" that is an enthusiastic way of saying one of those two words.
Hiello! How are you doing?
by The Kelv December 7, 2021
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a greeting,
something between a "hi" and a "hello"
josh: hiello, jock.
jock: washizile dizzle?!
by Benedict XXX May 16, 2005
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hiello is a mix of two words hi and hello.
John: hiello Sarah!
Sarah: oh hiello John, how are you today
by TOXIC---tears__x@vf.com April 12, 2006
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