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1) Latin for "thirsting."
2) According to the Clark County News of December 1875, it is a disease "caused from people sitting around too much and taking no exercise."
3) A palindrome that just happens to have the words "sit," "it," "tit," and "'tis" in it.
Laura, if you keep telling me to sit tight, I’m gonna get a bad case of sititis!
Urkel, if you don’t stop complaining you’ll get a worse case of broken-face-and-glasses!

Family Matters, Episode 88
sititis by Lexical October 14, 2007
Related Words

Systitis 

A computer showing the symptoms of a virus infection; turtle-slowness, inability to run certain apps or games, inability to browse through the internet or very slow internet browsing, and certainly will end in you having a high blood pressure.
A: My windows has a systitis for the last month.
B: It's probably because you're running an update-disabled fake version. Buy a genuine version, or replace your windows with any open-source os.
Systitis by Ahmed Zidan October 27, 2010

Acute Intra-sistaitis 

A very serious illness affecting the internal organs. Its occurs when the host (often non-black) is housing a younger middle age soulful black woman. This said black woman often grows inside of the host affecting their music taste, vernacular, and often accompanied by loud outburst of soulful hearty singing without warning. This persist undetected until the untimely end of the incubation process (often in the month of February , during Kwanzaa, or sometime at soulful R&B concerts and occasionally at church services). resulting in the host being absorbed and taken over completely. Although not fatal, there is a largely notable increase in attitude, melatonin, and overall spice and sassiness once this process has run its course. ...Do your part to detect AIS as early as you can.
"Boy Samantha keeps breaking out in bellows of soulful song, i hope she doesn't have Acute Intra-sistaitis."

sistosis 

A condition that exists when too many females inhabit a particular area.
This party is suffering from sistosis.
sistosis by Bigdinc February 8, 2018
Sistits is a word used to describe either your own or a friends sisters breasts.
Jack: Wow she's got some nice sistits.

Joe: Dude that's my sister!
Jack: So? My sister has some nice sistits as well.

Joe: What the fuck man?!
Sistits by Family Fucker 88 May 11, 2021

Sissyitis 

To be a sissy, Swelled up with Sissiness.
He isn't sick, he just has sissyitis.
Sissyitis by Starphi5h May 25, 2024