ham

Concise Oxford English Dictionary © 2008 Oxford University Press:
ham1

▶noun

• 1 salted or smoked meat from the upper part of a pig's leg.

• 2 (hams) the back of the thigh or the thighs and buttocks.

– origin OE ham, hom (denoting the back of the knee), from a Gmc base meaning ‘be crooked’.

Concise Oxford English Dictionary © 2008 Oxford University Press:
ham2

▶noun

• 1 an inexpert or unsubtle actor or piece of acting.

• 2 (also radio ham) informal an amateur radio operator.

▶verb (hams, hamming, hammed) (usu. ham it up) informal overact.

– origin C19: perh. from the first syllable of amateur; cf. the US sl. term hamfatter ‘inexpert performer’.