'To take potluck' definitions:

Definition of 'To take potluck'

From: GCIDE

Potluck \Pot"luck`\, n. Whatever may chance to be in the pot, or may be provided for a meal. [1913 Webster]
A woman whose potluck was always to be relied on. --G. Eliot. [1913 Webster]
To take potluck, to take what food may chance to be provided. [1913 Webster]