Big mama is called Mamacita. She is the big mama of the man
When she struggled to get off from taxi, the taxicab driver help to pull her. But, she can't say "thank you" to the taxicab driver because she can't speak English.
They always don't go outside because she is fat and cannot speak English. She sits all day by the window and sings all the homesick songs about country. Sometimes the man who live with Mamacita gets disgusted. Despite of his interference, she doesn't speak English.