"Tucka" is another name for a midget. It is onomatopoeia, in that, the name comes from the sound they make while walking (in my head at least). Next time you see a dwarf walking listen very closely, you can hear them as they waddle by: "tucka, tucka, tucka"
"Did you see that angry little tucka kick me in the shins?"
"That's because he was a tucka, I guess."