also o.b.o., abbreviation of or best offer, by 1969.
Online Etymology Dictionary, © 2010 Douglas Harper
Examples from the Web for obo
Yoosoof knew that if Kambira was to be got to market alive, Obo must go along with him.Black Ivory
Some enormous and majestic firs encircling the Obo, sheltered it with a magnificent dome of verdure.Travels in Tartary, Thibet, and China
Evariste Regis Huc
These obo are the Lamaite sacred signs set up at dangerous places, the altars to the bad demons, rulers of these places.
All the tops of the ridges of the Tarbagatai are thickly dotted with the obo of rocks and branches.
"Those are the obo, the sacred signs and altars for the bad demons watching this pass," explained the guide.