nocturnal rainbow 

A rainbow that occurs very rarely at night when it rains on a full moon. This is rare because the moon is not as bright as the sun.

-Dude were you looking outside last night.
-No why.
-There was a sick ass nocturnal rainbow, it was really faint tho.

nocturnal rainbow by The Capital-ᙠ August 2, 2016

nocturnal emission 

While you are sleeping, your mini-me decides to give his trumpet salute which leads to some unwanted secretion laying on your belly.

Man, I woke up to some unwanted spunk on my belly, man I hate nocturnal emissions...

nocturnal emission by Buzzzzzzzzzz August 10, 2006

Nocturnal Vagina Syndrome 

A condition that affects the female body.

After sex, the vagina feels different and uncomfortable, to the point of restlessness. No wipe or wash can cure this condition. One may even have to pee 30 times after sex due to this condition.
A woman may stay up all night no matter how tired she is due to the state of her vagina.

I cannot sleep because of Nocturnal Vagina Syndrome. Me and my husband has sex 3 hours ago and I keep having to pee and wash but my vagina feels off.

sex vagina nocturnal awake

Nocturnal Vagina Syndrome by Rpt93 November 28, 2012

Nocturnal Buga

The act of sexually assaulting a horse while sleepwalking

John did a nocturnal buga on Henry's horse last night while sleepwalking

Nocturnal Buga by GaribaldiTheConqueror February 1, 2021

Nocturnal beeb 

A boy, or possibly a girl, who, while watching a girl, sees every move that she makes as something sexual.

I don't like Johny, he's a nocturnal beeb.

Nocturnal beeb by Norton Johnson December 7, 2006

nocturnal cat nip 

when a female puts cat nip in her genitalia and lets a cat fondul with it

she just put it up there for the cat...I am always left out when my girl dos nocturnal cat nip

nocturnal cat nip by Kevin....? May 16, 2008

Nocturnal Flinching 

When someone is sleeping and they have a dream or thought of themselves getting hurt or falling, and their body physically reacts, and causes them to jerk or flinch rather spasmodically.

Guy: What the fuck tracy, you kicked me in the balls last night in bed???

Tracy: sorry, i had a bad dream and probably got a nocturnal flinching.

Guy: go fuck yourself, we're done.

Nocturnal Flinching by yuriogy1 December 5, 2009