Ill will is the amount of hate you generate from niggas around you
From "The Boondocks":

Riley: "I can't wait for niggas to start hatin', I can't wait."

Huey: "So you judge your success by the amount of ill will you generate from others around you?"

Riely: "Hey, if niggas ain't hatin' on you, you doin' somethin' wrong."
by Boondocks2914 July 22, 2008
nas's record label named after nas's friend, will, who was killed . also can be used if one of your friends is killed you call them your ill will.
lets go start shit whit em wanna be thugs there.

na nigga they aint no wannabes, nd I dont want you to be my ill will.
by John Calvin Young July 6, 2006
Yo Son, you see that ride over there?
Yea boy, that's ill.
by j illa May 29, 2008
1. means Dope, cool, tight, raw, phat, etc.....

2. To be sick
1. Yo that Beat was so ill

2. Those 2 boys there are ill with the flu
by AC December 23, 2003
Verb, Past tense;

an act of deviance usually pertaining to escaping from a situation in which money is required of the escapee.

an act of deception committed towards someone.
"I illed on our tab at the club last night; saved me some $200."

"That bitch was supposed to give me a ride home, but illed on me!"
by XT86 March 27, 2009