My son Henry (4 1/2) was learning about pussy willow at school.  As always, I asked him about what he did at school.  He handed me a little craft the kids did with pussy willow.  Later in the day Grandma asked him about school.  He said "We learned about wooly pisso."  Grandmas eyes were so big.  I don't know which sounds more offensive, pussy willow or wooly pisso.  We just don't talk about it at all.