sit-down

Among some lower-socio-economic segments of society in the South, a polite way of saying "using the toilet to defecate", which is generally considered much politer than more common expressions such as "taking a shit".

Student/inmate in a juvenile reform school to his dorm supervisor: Can I use the restroom?
Dorm supervisor: Do you just need to pee or do you need to have a sit-down?

sit on the floor

sitting on someone's genitals

want to sit on my face? "Can I sit on the floor first?"

Sit the ick

Sit the ick

Something you gotta do when you gotta do

"i gotta sit the ick"
"oh okay, go ahead"

Sit-down Comedy

A joke that is so bad it's funny.

That joke is was so bad, it could be considered sit-down comedy

Sitting Hick

When a couple eating in a restaurant chooses to sit next to each other in a booth or table leaving one side completely empty.

Originates from how hicks sit next to each other in their truck with out the space in the middle.

Look at that couple over their sitting right next to each other instead of facing each other.
I know right I hate when I see people sitting hick...its weird.

sit sit

When a female is on her menstrual cycle of the month. The term comes from being restricted to just sitting during the time of the month. Otherwise, one may experience the niagra falls coming down.

Susan has been quite bitchy lately, is she on her sit sit?

Sitting hot

When you poop your pants and just continue to sit in it.

“Dude it’s sitting hot” “I gotta go, I’m sitting hot”