I'm Walkin' Here!

I'm walkin' here. I've heard it mimicked plenty of times, but I didn't know the origin of the phrase until someone mentioned it last weekend. I yell at drivers whose cars come to rest in crosswalks all the time. But I say "I guess I'll just walk out here in traffic with my BABY and my LITTLE GIRL! Sometimes they actually back up. Most of the time, they ignore me.