I wonder why kikuyus had this saying. I think they had encountered a tribe in rv that loved to beg. in my place if you begged the retort was wee uhoyete ta MurumbwA...
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look at these two shameless beggars
my roommate mum was in grains cartel logistics side. she transported relief food to Turkana and morale. she told Me if you promise a Turkana something they will remind you every half hour. to make sure you give it to them. May be Turkanas were the Rubwas kikuyus traders encountered