Bo
Origin 1
Imitative.
Full definition of bo
Interjection
- An exclamation used to startle or frighten.
- 1603, John Florio, translating Michel de Montaigne, Essays, II.37:We may fairely cry bo-bo-boe; it may well make us hoarse, but it will nothing advaunce it.
Origin 2
Probably a shortening of boy.
Noun
bo
- (US, slang) Fellow, chap, boy.
- 1940, Raymond Chandler, Farewell, My Lovely, Penguin 2010, p. 255:‘Never heard of him,’ he smiled. ‘On your way, bo.’