Mackem
/ˈmakəm/(also Makem) British informal (originally English regional (north-east. ))
noun
A native or inhabitant of Sunderland or Wearside; a supporter of Sunderland Association Football Club.
Origin
1980s; earliest use found in Magpie. Apparently from mack, mak, regional variants of make + 'em, variant of 'em.