Twillin means to spin or rotate something very fast.
Damon: Man did you see that guy?!?
Mark: Yeah he was really twillin his meat around in her face.
The act of not giving a f*ck.
Mark: Joe that project is due in 2 days!
Joe: Well we better start twillin.
Some higher version of bat shit crazy.
Guy a : "Yea she came over and gave me the glock glock 50,000!"
Guy b :"Man, you Twillin'!"
A combination of African American and Southern slang for "twin" and "children" See also Twidruns, Twilluns
"Keith will be hangin' with the Twillins this weekend."