"Rizzmas" is a combination of "Rizz" and "Christmas". Assumingly, "Rizzmas" is when someone, perhaps a "Rizzler", "pulling" multiple partners near or around christmas time.
(This example is a work of fiction. Any references to real people, places etc is purely coincidental.)
Dave: "Yo man," he enthusiastically yapped as he slapped John's shoulder, "it's almost rizzmas, man!"
John: Unamused, John snarkily retorts, "You motherfucker, you didn't pull nobody all year! Go ahead and fucking try 'rizzmas' this year and watch yo ass get thundercunted across campus."
It's the Christmas we already know, but more rizzy. During the winter (arc), we have Rizzmas, a rizzful, mewingful and sigmaful season of the year where you pass the time with your family and you can farm much aura and, with some conditions, you can get aura boosters: Having (John) pork for dinner (1.5x) Having a skibidi toilet in bathroom (x3.5 aura), being from Ohio (x5 aura), Getting a 730 days gooning/mewing streak (x10 aura).
It also has a musical variant from "Last Christmas", nominated "Last Rizzmas", by Elliot Cox, an artist known by his brainrot covers in TikTok
Last Rizzmas, I gave you my gyatt, but the very next day, you gave me your Drake -Elliot Cox, 08-11-2024