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To suck a man's balls so hard that it causes pain.
"She was giving me head and then she moved south and sucked my balls so hard it hurt"
"Damn she niffed you"

There's a fine line between sucking balls well and niffing.
Niff by nico-zani August 1, 2021
Related Words
Niff niffer niffo niffie niffty niffle niffy Niffa niffing it niffler
A tall guy with curly hair who has good chats. A good friend. Is into brunette girls who are short and slim.
Ah Niff is into her
NIFF by Uasmina41 March 23, 2022

niff-naff 

afro-american riff-raff
I don't drive down there... its full of niff-naff.
niff-naff by red-eyed vomit eater December 16, 2008

niff titt 

A word you cry out when something goes wrong.
*gets sat on by a friend* AHHH...niff titt
niff titt by 3645745 August 12, 2006
When you sniff your homies fart
homie: “yo you see Jacobs ass right there, I know he just farted, niff it dude”

*sniffs homies fart*

Jacob: “aye yo did you just niff me”

Hogey Ton Googie Niff 

That cloud, way up in the sky, that you dreaming, and hoping about one day riding, with yr falcon, yr falcon weewee.
You: One day, one day I hoped to be acquittaned with the hogey ton googie niff