From Wiktionary, the free dictionary
A reference to the paleness of the person’s complexion, like the colour of mayonnaise.
- Hyphenation: may‧on‧naise face
mayonnaise face (plural mayonnaise faces)
- (slang, derogatory, ethnic slur) A person of northern, western, or central European heritage, especially in contrast to someone of southern Italian or Sicilian heritage.
2008, Georgia Durante, The Company She Keeps[1], →ISBN:Tommy was the only mayonnaise face in the group, a tall, thin Irish guy with curly red hair, jail-pale skin, and a quick wit.
2009, Tommy Jon Caduto, Fight Or Die: The Vinny Paz Story, →ISBN, page 10:"How does this mayonnaise face," referring to O'Grady, "know how hard Vinny can punch?"
2015, Kris Saknussemm, Private Midnight: A Novel[2], →ISBN:Naomi Sparks, an alternate cheerleader I'd made out with once in my car and had never spoken to since—after she called me Mayonnaise Face.