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
its like saying sweet, cool or sick
oh my god man that car is so ill!!!
by metzner December 18, 2007
Contrary to most of the definitions found here, this is the correct one:
'ILL' : Adjective meaning 'wild' or 'crazy'. Not always derogatory, but used when something may be so outrageous so as to be unruly.
'ILLIN': Adjective or Verb. Lunatic behaviour. See above.
"The guy was drunk - he was Illin'"
"With those green and yellow clothes you look real ill."
by rapster tee February 9, 2006
To get shitty or get an attitude with someone. or to be bitter and pissed off, angry, especially when showing disrespect or after been disrespected or humiliated or getting fucked off
goddamnit dont get salty and ill with me mother fucker.
by asdasdasnnn3993 March 29, 2010