We hear that several times a day lately. Nate will stick something in our faces and deadpan, "BITE IT". It is the funniest thing. He will also offer his foot on occassion and invite us to "kiss it". Believe me, it's pretty funny.
We went over to the neighbors this afternoon and I took my camera and actually caught the aftermath of "bite it".
I also thought this little series of pictures was so funny. I don't know what made him laugh, but I'm glad I caught it!