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-o an add. to a word, or first part of a word, forming a colloq. or sl. expression or a familiar or joc. equiv., as like billy-o, lie doggo, ammo (for ammunition), beano (for bean-feast); sometimes, the last syll. of an abbrev. form. as compo|sition, hippo|potamus, photo|graph; in cheer(i)o, right(y)o, -ho, perh. the int. O, or after hallo.