Wet Behind the Ears

An idiom that means inexperienced or naive.

Its meaning comes from a baby that has just been born and is still wet "behind the ears" among other places.

This term might alternatively have originated on the farm, as it is said that after birth the last part of a foal or calf to dry is the area behind its ears.

"Those con artists thought they could make a quick buck out of me; they thought I was still wet behind the ears. But I showed them!"

Wet Behind the Ears by Raging Dragon July 16, 2008

still wet behind the ears 

not yet mature or experienced(an allusion to the wetness behind a newborn baby's ears)

As far as education goes, you are still wet behind the ears.

still wet behind the ears by Light Joker October 9, 2006