Born On a Sunday 

A euphemism for gay
From the last line of the poem "Monday's Child":
"The child born on the Sabbath day is bonnie and blithe and good and gay"

"I wouldn't ask him out if I were you... I hear he was 'born on a sunday'"

Born On a Sunday by Cecilll November 4, 2017

Born on a Sunday 

Gay, a secret way of saying someone's gay

Taken from the last line that one old poem "Monday's Child is Fair of Face"
"A child born on the Sabbath day is bonnie and blithe and good and gay"

Jennifer: Craig's kinda cute, dontchya think?
Dani: Yeah but he's...yknow... born on a Sunday
Jennifer: Oohhh nevermind then

Born on a Sunday by Cecilll August 8, 2017