See this thread: Cartoons: Tongue hanging out = determined - why? 
WAG: I thought the joke was that it was more than likely that the sweater would be washed by the next time Grammy came over, and the kid didn’t realize it. “Ha Ha, look at cute things kids believe” :rolleyes: Not very funny IMHO. The backwars s’s are just a further lame attempt to make it even cuter. :rolleyes: :rolleyes:
Either that or its a secretg message to the Illumanatus. 
Maybe the joke is the “jooze” is a misspelling of “jizz.” That must have been quite a party.
Whoa! The colors! Wish I had those around back when I was doing acid.