Wasei-eigo from English 'pork ham'; refers to ham made from pork, essentially the same as regular ham in English.
wasei-eigo (Japanese-coined English), from pork ham
I fried some ham for breakfast.
This sandwich has ham in it.
Variant with interpunct; less common but still encountered.
Wasei-eigo formed from English 'pork' and 'ham'. It is wasei.