Sentence:  “Rahther, I say. But you understand, of course, that I'm giving him a bit of <WSD>spoof</WSD>.” / “A bit of what?” / “<WSD>Spoof</WSD>—<WSD>spoof</WSD>. Is it possible that you have been here since Saturday without learning what ‘<WSD>spoof</WSD>' means? It means to chaff, to joke. In the States the slang equivalent would be ‘to string' someone.” / “How did you learn it?” / “A cabby told me about it. I started to have some fun with him, and he told me to ‘give over on the <WSD>spoof</WSD>.'nb...” 
Meaning of the word marked with <WSD> tags:  An act of deception; a hoax; a joking prank. (from 1889)