A person who only shows up to an event or occasion every so often and not all the time.
Its name derives from people who only go to church on Sunday and not on other days on the church calendar.
Its name derives from people who only go to church on Sunday and not on other days on the church calendar.
Guy 1 - Where's John? We haven't hung out with him in ages.
Guy 2 - He's just a Sunday Boy, forget about him.
Guy 2 - He's just a Sunday Boy, forget about him.
by JohnSmithLad August 5, 2011

by Masterlin May 18, 2021

by Stoney Sunday May 15, 2016

1. A sinister uncle/close family friend, think of an uncle buck type character, only instead of late 80's hijincks, he brings inapropraite touching and the need for years of therepy as an adult.
2. A sleazy fat man with predilections that ensure he will be found on the sex offenders register.
3. A dull episode of Gunsmoke from around 1955.
2. A sleazy fat man with predilections that ensure he will be found on the sex offenders register.
3. A dull episode of Gunsmoke from around 1955.
Yo dawg, my uncle sunday came over and he gave me a sip of his beer. I don't remember what happened next but when I woke up my clothes were inside out.
by faust2501 August 8, 2018

the national holiday signifying the rebirth and resurrection of toast cans that occurred on november 28th.
“omg it’s toaster sunday!”
“happy toaster sunday toast cans!”
“and on this day, god reserected toast cans and toaster sunday was born.”
“happy toaster sunday toast cans!”
“and on this day, god reserected toast cans and toaster sunday was born.”
by toast mads 2.0 July 3, 2021

That day when all the senior girls in your high school post cute pictures of themselves, causing you to masturbate violently.
by Christina Phillips November 11, 2019

The name used for a one night stand when the person hangs on in the house the next day. Could also be a sunday girlfriend.
Johm: "Who's that guy in the sitting room?"
Karl: "Oh thats Kate's latest sunday boyfriend, she was out drinking last night."
John: "Oh right, what a slag!"
Karl: "Oh thats Kate's latest sunday boyfriend, she was out drinking last night."
John: "Oh right, what a slag!"
by Derminator February 8, 2009
