noun Slang.

a companion or associate, especially an older person who mentors or advises; a godfather.
a member of a criminal organization. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Word Origin and History for goombah

by 1984, from dialectal pronunciation of Italian compare "companion, godfather" (cf. compadre).

Online Etymology Dictionary, © 2010 Douglas Harper