slip sth. into one's pocket
What does "slip into one's pocket" mean in this following sentence?
This crèmerie was run by Madame Camille and her daughters, who fussed around Renoir, giving him the runniest bits of Brie and slipping extra bits of food into his pockets.
From the given context, I think the phrase means give sth. away, correct ot not? And what does "fuss around sb." mean here? In fact I'm given several different significances by the dictionary and I'm quite perplexed.
Thanks a lot for your help.