See fair-weather Christian and C&E Christian.

A person who only goes to Catholic mass to observe certain holidays, usually once or twice a year. This includes people who are forced to go, people who go voluntarily, believers and non-believers.
My family were a bunch of Once-A-Year Catholics, so whenever they made me go I got an anxiety attack for the whole mass.
by No Derps April 28, 2018
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A friend who isn’t readily available to you even though you swear you’re tight and refer to them as a bestie. Although you genuinely get along well, you’re still not in their top tier of go-to friends. Realistically, you’re just inbox and text buddies who may happen to hang once a year.
She thinks her once a year friends really give a shit about her, they wouldn’t piss on her if she was on fire.
by Yellowcard65 July 27, 2021
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Relatives, usually extended, that you only see once or twice a year on major holidays. Usually these visits are preceded by a great deal of apprehension and distress.
Jessica: So, I'm getting my hair refoiled, my nails done, and then going out and eating my body weight in chocolate

Becca: Oh..once-a-year relatives coming into town?

Jessica: Ya. I hate the holidays!
by razorclam April 7, 2010
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One of the greatest quotes to ever come out of Jimmy Neutron.
Hugh once said: “I don’t mind Once I was 7 years old and I sat on a banana and of course that changed my life”
*earrape ymca music starts playing*
by S/he’s just a friend January 14, 2022
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