Um Gwalla gwalla

The state senator was seeking votes for his election campaign for Congress and decided to visit the local Indian reservation. He stood in the large community hall and told the Indians what he would do for them if he was elected.
"I think the time as come when you people deserve to really control your own destiny," he said.
From the crowded auditorium cam a responding chorus, "Um gwalla gwalla!"
The senator smiled. "Furthermore," he continued, "I think the time has come for your old people to get really good pensions."
Again from a chorus of "Um gwalla gwalla!"
He nodded approvingly. "One more thing," he said, "if I'm elected, I'm not going to rest until everyone of you Indians get full citizenship with all the rights every full-blooded American has."
One again, there was a loud responding roar of "Um gwall gwall!"
After his speech, the senator was given a guided tour of reservation. he saw a high fence and asked what it contained.
The guide said: " That the place where we kept bulls. Now just empty grazing ground. No bulls now".
"Good!" he said, and started to climb over the fence.
His guide warned: "Be careful, senator! you go in there you liable to step in much gwalla gwalla."