Elementary, My Dear Watson

Sometimes I have to remind myself that I work at an elementary school.  Usually this is brought on after asking a student for the third time in a row to please take the scissors out his mouth.  Then there are other times where I'm reminded against my will.  Such as this morning, when I overheard two teachers talking:
"Any poop or pee yet today?"
"Nope, but it's still early."
A few minutes later, a boy came racing inside from recess amidst a furious temper tantrum, screaming, "Pu du cul!  Pu du cul!" at the top of his lungs.  Understanding that this was something rude, but not quite sure of the literal meaning, a teacher took it upon herself to mime out the meaning for me.  Miming is a great tool for teaching foreign languages.  I mime hats, weather patterns, animals and pencil cases on a regular basis.  Today I realized the efficacy of this method first hand as the teacher first held her nose and crinkled her face up in disgust, and then pointed to her rear.  I gathered then that pu du cul roughly translated to stinky butt.  Add that to my ever-growing arsenal of vocabulary I would never have learned if I didn't work at an elementary school.