Definition of No-Mates in US English:

No-Mates

noun

British
informal
  • A person (usually a man) regarded as lonely or having no friends. Usually as a humorous surname used with a generic first name, as "Billy No-Mates", etc.

Origin

1990s; earliest use found in The Sunday Telegraph. From no + the plural of mate, probably popularized by use as a T-shirt slogan in the early 1990s.

Pronunciation

No-Mates

/ˈnəʊmeɪts/