So basically the song goes like this:

I needed some inspiration, so the first thing i saw i decided i was going to right a song about. Guess what...i saw a cookie jar. Here's how the interpretation goes

Kid comes down the stairs after smelling his mom's newly baked cookies, yet he is being sneaky because he KNOWS he is not supposed to have any because they are a donation to children hospitalized with terminal illnesses. So he sneaks around to see if anyone is watching, then, he approaches the cookie jar on the counter. HE IS HOME FREE! But wait! OMG! IT WON'T OPEN! With a look of disbelief on his face, he tries again, convinced it was only a mess up. He tries again. BUT IT STILL WON'T OPEN! He becomes enraged and begins to bash the cookie jar with his fists, but to no avail!

With his nostrils flaring and his brow furled into an angry scowl, as if to say "i don't need the rest of my face to show i'm angry right now", he GRABS the cookie jar and storms outside. With a loud grunt the child throws the cookie jar into the air in a last ditch effort to get his precious cookies. The cookie jar flies up into the air, and comes down with a loud CRASH! At first the child is delighted, but his glee is short lived, when he realizes the very cookies he was trying to get out of the jar were destroyed! Destroyed by his own selfishness! Nothing now remains but small crums of cookie and the occasional chocolate chip, mixed with shards of pottery. With his hope of eating a tasty chocolate chip cookies destroyed, he falls to his knees and begins to cry...tears stream down his face as he stares at the remains of the tasty goodness on the ground before him. Never will he know what it would have been like to eat those cookies........he was never seen again....

Moral of the story: don't steal cookies from terminally ill children!