A word use when screaming loudly for no apparent reason, only to disappear and drop mediocre items in your absence. Usually following ah and ga, ubwaa is the ultimate way to go crazy for no apparent reason.
A common exclamation frequently used while performing a specific kind of groin kick described as follows:
Grab the victims ankles while lying on the ground directly across from them. Then, as you thrust into their groin with your foot, pull their ankles apart in a "wishbone" motion. For the most devestating effect, "Ubamsh!" must be shouted directly as the foot comes into contact with the groin.