An african-american style threat obtained on the account of insubordination often from parent to child (as well as other exchanges). It is not strictly limited to african-americans. Although it is usually just an empty threat used to express reproval, it very well can be followed by a severe beatdown or whoop. The whooping itself can be performed using accessories such as a belt.
O hell no, son, you better not eat that last piece of chicken or im gon' whoop yo' ass!
I heard you dropped outta school and gon' to jail. Thats my boy! But now i heard that you be foolin wid dose white boys! Come here, im gon' whoop yo' ass!