ouboetn.
/ˈəʊbᵿt/, U.S. /ˈoʊbət/, South African English /ˈəʊbʊt/ South African colloquial.
(An affectionate or familiar form of address or reference to) an older brother or male friend.
ΘΚΠ
the mind > emotion > love > terms of endearment > [noun] > of or to a man
sonOE
brotherOE
friarc1290
lad1535
fellow1577
bubba1841
old top1856
bra1869
bro1918
mush1936
ouboet1953
coz1961
oppa1963
bruv1970
1947 A. Keppel-Jones When Smuts Goes viii. 153 The Ministers have been summoned urgently; they arrive one by one, a little out of breath, flushed. ‘Middag, Mr President.’.. ‘Middag, ou Boet.’]
1953 U. Krige Dream & Desert 10 Kleinboet would call him Ouboet, eldest brother. Ouboet... It was such a good name, it had such a full round sound.
1982 Sunday Times (Johannesburg) 5 Sept. 4 No, no Cappy ou Boet, this is certainly not ‘the winter of my discontent’.
1990 C. Leonard in Weekly Mail (Johannesburg) 2 Nov. 28 It is a family occasion, with the ou toppies, ma, pa, ouboet and the kids listening to the music and braaing under the eucalyptus tree.
This is a new entry (OED Third Edition, December 2004; most recently modified version published online March 2022).
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n.1953