I mean to say, when a girl, offered a good man's heart, laughs like a bursting paper bag and tells him not to be a silly ass, the good man is entitled, I think, to assume that the whole thing is off. In the light of this [marriage] announcement in The Times I could only suppose that on one of these occasions, unnoticed by me possibly because my attention had wandered, she must have drooped her eyes and come through with a murmured ‘Right-ho.’ Though when this could have happened, I hadn't the foggiest.
Source: wiktionary