Ham  —n. 1 a upper part of a pig's leg salted and dried or smoked for food. B meat from this. 2 back of the thigh; thigh and buttock. 3 colloq. (often attrib.) Inexpert or unsubtle actor or piece of acting. 4 colloq. Operator of an amateur radio station. —v. (-mm-) (usu. In ham it up) colloq. Overact. [old english]