Sentence:  At each door he poured from the can into a pint measure and into the house-wife's jug, always with a <WSD>tilly</WSD> for the cat, whether there was a cat or not, sometimes splashing the step with milk to the annoyance of the housewife. 
Meaning of the word marked with <WSD> tags:  An extra product given to a customer at no additional charge; a lagniappe.