Definition of Molson muscle in US English:

Molson muscle

(also Molson's muscle)

noun

Canadian
informal
  • A paunch caused by drinking beer, a beer belly.

Origin

1980s; earliest use found in The Toronto Star. From Molson, the trademark of a Canadian brand of beer + muscle.

Pronunciation

Molson muscle

/ˈməʊls(ə)n ˌmʌs(ə)l/