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once in a purple moon 

An extremely rare occurrence, rarer than 'once in a blue moon'.
A particular team winning the championship happens once in a purple moon. A total solar eclipse seen from Europe happens once in a purple moon.

Once for a lifetime opportunity 

When the chance arises to do something illegal you've always wanted to but you unfortunately know it would likely get you a lifetime sentence in prison.
Jim: "Hey I was stopped at a pedestrian crossing and then of all people I see my boss, walking out in front of me. I could've flattened him."
Bob: "Too bad you passed up on a once for a lifetime opportunity."

once you go black you'll never go back 

Just like 1 being larger than 2, "once you go black you'll never go back" is false.

Once you go black, you never go back 

Vulgar idiom with American origin is typically used to imply that sexual activity with an African American or a black person is so enjoyable that one will exclusively seek out black partners in the future because of that.

Likely to harken back from taboos surrounding African Americans during the Antebellum period in United States history. During this period, large amounts of stereotypes existed around African Americans, many, also sexual. Racist ideas were held like that black men were considered to be animalistic and unable to control their sexual urges, which made having a romantic relationship with a black man, especially as a white woman, extremely taboo. All southern states had anti-miscegenation (anti-interracial marriage) laws, which weren’t abolished until June 12, 1967, by Federal law.

Many kinks surrounding black men specifically, like many kinks, are rooted in older taboos, which are now gone.
“Ava said that since her last boyfriend, she has had an amazing sex life.”
“Well you know what they say.”
“Yeah, 'Once you go black, you never go back'.”

once in an orange moon 

Similar to once in a blue moon, except that this phenomena of an orange moon actually occurs every now and then when there's a lunar eclipse.
Jim: "Hey Kareem, do you ever get a chance to go to the movies anymore?"

Kareem: "ha, once in an orange moon man... a bit busy plus I can't really afford to anyways so I check out old movies from the library"
once in an orange moon by Adel7 January 1, 2008

once-ler 

A faggot ass tree choppin bitch and there moms a thot
That dude (once-ler) is gay
once-ler by Yourmommanigga March 2, 2015