smeg

v. smeg-ged, smeg-ging, smegs v. tr. interj.

Vulgar Slang. Used in the imperative as a signal of angry
dismissal or displeasure.

(Similar to the word "fuck" in its versatility, "smeg" is
short for the real word "smegma" - n. A sebaceous secretion,
especially the cheesy secretion that collects under the
prepuce of around the clitorus. The soapy substance covering
the skin of newborn infants. The cheesy, sebaceous matter
which collects between the glans penis and the foreskin. --
from Dictionary.com, seriously!)