I've going to sell a cow

Wayne the Windows was supposed to be coming here tonight to measure up for our new windows. He just phoned and said, 'I'm sorry I can't come; I'm going to sell a cow.'
I said, 'Is that a euphemism?' (I didn't actually say euphemism because I couldn't remember the word.)
'No, I'm going to sell a cow.'

I hope he gets some magic beans.