What Did That Boy say?????

Where we live, there is a small park in our backyard.  Literally.  I can look out the kitchen window and see the jungle gym.  As you can imagine our girls spend a LOT of time over there playing.  9 out of 10 times they will be the only ones out there.  The other day a little boy from their bus was out with them.  He is 5 and in Kindergarten.  They played together for awhile and we checked on them frequently.  Saturday as we were on our way to the Farmer's market the Hippie spoke up from the backseat.  "That little boy uses lots of words that we don't understand because we don't know what they mean."  My husband and I exchange meaningful glances. "Um what words sweetie?"  "Things like 'Holy Crap'!"  "Oh, well we are very proud of you for telling us that he says that, but we really don't say the word crap.  It is not a nice word to use."  "What does it mean Mommy?"  "Poop" Giggles from the backseat.