Once in a Bluemoon

To do something very rarely, once in a while.

For Example: “Once in a BlueMoon” DKS Getting a Win On CK

by CK~Hyuga July 4, 2019

once nigga

A dead black person

Tupac is a once nigga.

by Cthiemann April 23, 2015

once in a blue

Shortened version of"Once in a Blue Moon"

I travel there once in a blue

by Vista2Fit December 2, 2017

Not Even Once

The phrase refers to an anti-drug ad campaign that revolved around showing pictures of people in ruin with the phrase "Meth: not even once", general implication being that if you do meth even a single time it will suck you in and ruin your life.
The ad took off in the internet and was re-purposed, replacing "meth" with other things (X: not even once), generally meaning that the author of the image thinks that practicing X will lead to no good.

Someone seeing a woman's poorly-thought out tweet concerning a hot button political issue:
- Woman in politics: not even once.

by NKSedya August 6, 2019

once over

1. A quick glance

2. a hasty preparation

He gave my work the once over and left.

by The Return of Light Joker March 25, 2009

once in a while

A measure of time no less than 30 calendar days. Occasional

I believe Wade every once in a while

by Calm Dae September 2, 2013

once-ler

A faggot ass tree choppin bitch and there moms a thot

That dude (once-ler) is gay

by Yourmommanigga March 2, 2015