Top Definition
A slang variation of hello, most commonly used by teenagers to start a casual, laid back conversation. Often this conversation takes places online using an instant messenger service, and so incorporates the appropriate slang.

Derived from the the utterance 'mmm' and the word 'hello'.
Alternate spellings include 'mmmyellow', 'myellow', 'myello' and 'myallo'.
'Myello, how's it going?'
'Mmmok, u?'
'Meh...'
by Annelise November 04, 2004

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