Meaning
A warm greeting or acknowledgement — to greet, salute, or send respect to someone. As a verb, to 'hail up' a person is to greet them, and as an exclamation 'hail up!' works like 'greetings' or 'big up to you'. Rooted in reggae and Rastafari courtesy, where hailing one another is a mark of fellowship and respect, it is a friendly, upful way of acknowledging a person, whether in meeting them, calling out in passing, or sending good word from afar.
Examples
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Hail up mi general, wah gwaan?
Greetings my friend, what's going on?
Used as an opening greeting; 'general' is an affectionate term for a respected friend.
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Mek sure yuh hail up di elders dem.
Make sure you greet the elders.
Here 'hail up' is a verb; 'dem' pluralises 'elders' respectfully.
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Big up an hail up to everybody weh a listen.
Respect and greetings to everyone who's listening.
Common on radio and in music as a shout-out formula.
Origin
From English 'hail' (to greet or salute), reinforced within Rastafari speech where 'hail' carries reverent, honouring connotations, plus the intensifying particle 'up'.
How it’s used
Respectful and friendly; widely used, with particular warmth in Rastafari and reggae culture. Suitable for greeting elders and equals alike. Rarely inappropriate, though it is casual rather than formal.