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A Japanese meme, born in 2002 on 2channel, a Japanese text board. In Japanese it's spelled ぬるぽ. Whenever someone says it, the obligatory response is "gah!" ( ガッ). Became famous outside of Japan mostly because of the visual novel and anime Steins;Gate.
Okabe: Nullpo!
Kurisu: Gah!
Nullpo by oishiiii July 9, 2018
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Class 1 Nullo - A man who has had his testicles removed (castrate).

Class 2 Nullo - A man who has had both his penis and testicles removed (smoothie).

Class 3 Nullo - A man who has had his penis, testicles, nipples and belly button removed (extreme smoothie - xsmoothie).

Class 4 Nullo - A man who has had his penis, testicles, nipples, belly button, fingernails and toenails removed (nullunx).

Class 5 Nullo - A man that has had his testicles, penis, prostate, seminal vesicles removed to prevent any sexual function and who cannot physically ejaculate. In addition, his nipples and belly button has been removed to prevent any sensitive parts of his body from being stimulated. His has had both his fingernails and toenails removed so that the end of his phalanges are smooth. (extreme nullunx - xnullunx)

Class 6 Nullo - A man that has had his testicles, penis, prostate, seminal vesicles removed to prevent any sexual function and who cannot physically ejaculate. In addition, his nipples and belly button has been removed to prevent any sensitive parts of his body from being stimulated. His has had both his fingernails and toenails removed so that the end of his phalanges are smooth. In addition his ears have been removed so that he has no protrusions on his body (unicorn).
After the man had sexual confirmation surgery, his dream was to become an xnullunx (the ultimate nullo).
Nullo by XnullunX November 25, 2018
Related Words
It is defined as the value of 0,000,000.
A Nullion is not just nothing it is a whole lot of nothing!
Nullion by JTK October 2, 2014
Males who have their genitals removed.
Mephisto is such a nullo
Nullo by Mephisto's dad July 25, 2003
man who removed his own penis
stands and unbuckles pants and drops them to his ankles, revealing a smooth, shaven crotch with only a thin scar to show where his genitals once were
nullo by rob nash July 25, 2003

Nullcorn 

A unicorn without a horn, what people used to call a "horse".
Girl #1: I rode a majestic nullcorn yesterday.
Girl #2: Don't you mean a horse?
Nullcorn by agentarsenic May 9, 2010

nullpink 

nullpink is a top secret cloaking substance invented at some point in the 20th century
John Cena is able to go invisible with nullpink he acquired while in the service
nullpink by CoryTheCurator September 20, 2022