More of a ADV advrider thing.
As for when started? It has been this way for a long time in the USA. May have started in WW2 among soldiers but I have seen westerns where it was done. More of a way to express affection between people that have been threw a lot together that the outsider will not get.
It is seen as a manly way to say hi, I like you a lot and lets shock the people that are not in the group.
If you follow the people that do this you will find they save this greeting for people they feel are good enof to be in there club the outsider will get a standard non feeling "HI" or Hello". It is far from showing a lack of respect it is a way to show the deepest respect and inclusion in the group.
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