Define Pay Twice Meaning

PAY TWICE
Noun. a name for an extremely overweight person, someone who would have to 'pay twice' to get in the cinema, ride a bus etc.

Man 1 "you've put some weight on since I last saw you you've turned into a proper 'Michelin Man'"
Man 2 " I gained 80 pounds"
Man 1 "you fat pay twice, I bet your gut has its own postcode now"
Man 2 "I've been a bit pie-friendly recently"
By Stoddard