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1.
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.
by Gen Snafu October 13, 2010
 
2.
The act of not giving a f*ck.
Mark: Joe that project is due in 2 days!

Joe: Well we better start twillin.
by mad man! December 01, 2010
 
3.
slang for "twin children"
"keith will be chillin' with the twillins this weekend.
by KeithD76 March 05, 2008
 
4.
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."
by KeithD76 March 05, 2008