About the phrase "I'm gonna lick me a rainbow."
I watched Shrek Forever After, 2010 movie. There is a scene where Shrek is carrying a cake on which a rainbow and an ogre face were painted at Shrek's kids' party. Then, Donkey shows up and says, "I'm gonna lick me a rainbow." before he licks the cake. Why is 'me' added before a rainbow? It doesn't sound natural.
And I found out there is goods with the phrase printed on it, such as T-shirts and mugs. That's why I was more curious.