FYSI 

Acronym that means "For Your Sexual Incompetence". When one is informing someone who is clueless about a sexual term. FYSI can be used the same way as FYI but of course FYSI is directed towards sexual terms.

Yasi: Your fellatio is getting worse!
Willy: Fellatio? What is that?
Yasi: FYSI..Fellatio is oral sex!

FYSI by TriollatioTata February 3, 2010

FYSIKS 

FYSIKS is a term used mainly by the science nerd in their natural habitat in place of 'Physics'.

Wow, i really need to pass FYSIKS this time, or i'm screwed.

FYSIKS by PAFaieta April 9, 2010

fysigtbabr

Text slang for Fasten your seatbelt it's going to be a bumby ride

Hey, FYSIGTBABR.

fysigtbabr by easton229 March 4, 2009

Fysicks

Meaning Fucked up physichs

That s some real fysicks you just demonstrated

Fysicks by impetigo October 26, 2017

Fysion 

Proffesional Critical Ops Player and a good YouTuber 10/10 recommends subcribing to him

Fysion is basically a proffesional Critical Ops player and a good YouTuber 10/10 recommends subcribing to him. His friend Spix or also known as SxD is a great guy

Fysion by kurez July 12, 2020