Then one day the cat got her

That someone passed away or died.

Then paulie says "then One day the cat got her. "Realizing his friend ivy had died.

one-a-day

A beneficial defecation regimen.

It never fails, when I travel my vitamin (one-a-day) routine is impeded.

one of those days

when you've drunk so much you transpire acid the next day and resent looking in the mirror to see the regret in your eyes.

"oh it's one of those days. demon days. we'll get over them."

one day I poked my brother in the eye with an apple pencil. she cried and cried. it was pretty warm so I didnt need a blanket on the hot day of winter

Confliction. Also, you’re not automatically funny by putting this into Urban Dictionary

Guy1: one day I poked my brother in the eye with an apple pencil. she cried and cried. it was pretty warm so I didnt need a blanket on the hot day of winter
Guy2: You’re an idiot.

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National One Nut Day

The one day in November you can nut

Tim: Ugh i wish i could nut
Rob: You can! Its National One Nut Day!

Day One-ing

Having sex on the first day of college.

"Hey bro, are you planning on Day one-ing it when you go to college?"

"Yeah man, I want dat pussy as soon as I can get it!"

No one on discord day

No one on discord day is when no one is on discord this holiday is on december 13th

Wolfgang: Hey todays No one on discord day
Oda: Well darn