Translation, Please?

E has his own special language, but there is something he says over and over that we're just dying to understand - BEESA BASE. He says it all the time. Over the weekend, he was singing a song with only beesa base as the words. It was cracking us up, because it almost sounded like he was rapping. Here's a video of it... it was in the car so it's not great, but I wanted to capture a beesa base moment. Maybe someday he'll be able to tell us what it means.