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According to straattaalwoorden.nl, niffie means: knife, derived from the English “knife”. The ethmology of the word is derived from English knife → “nif” → “niffie”.
He had his niffie with him."

"Watch out man, someone pulled his niffie."
Niffie by Marktttttgg10tjee_JWZ November 24, 2025
Related Words
niffie niffer niffle niffing it niffler nuffie Niffed NIFFIRG niffit Niffneck
According to straattaalwoorden.nl, niffie means: knife, derived from the English “knife.” Etymology: derived from English knife → “nif” → “niffie”.
"He had his niffie with him."

"Watch out man, someone pulled his niffie."
Niffie by Marktttttgg10tjee_JWZ November 24, 2025
According to straattaalwoorden.nl, niffie means: knife, derived from the English “knife.” Etymology: derived from English knife → “nif” → “niffie”.
"He had his niffie with him."

"Watch out man, someone pulled his niffie."
Niffie by Marktttttgg10tjee_JWZ November 24, 2025
Niffie is an old Dutch street-slang word used to refer to a knife. It appeared mainly in older street culture and youth slang before modern slang terms became popular. The word is used in informal situations, often with a playful or slightly cautionary tone.

Etymology:
Derived from the English word knife. In street slang, knife shifted to nife → nif → niffie, with the “-ie” ending adding a typical Dutch informal sound.
Yo bro, why you walking around with a niffie on you?”. “Back in the day everyone said niffie, nobody really uses it anymore.”
Niffie by Marktttttgg10tjee_JWZ November 24, 2025

Nifferous 

A man who has been toxic and manipulative towards his girlfriend and has done more evil along the way.
Nifferous can come in many names such as
Good Nifferous, Nifferous B, and Nifferous 7&8.
Damnit, Good Nifferous strikes again… He tortured another woman… However this time she was a minor…
Nifferous by FenrisFrog March 22, 2023

Retep Niffirg 

An Evil Clone of A Person From a popular adult animated american sitcom Family Guy
Retep Niffirg by Unsalted Peanuts December 12, 2022