mod. being ill; being sick. : She was illin' big time and could not come to class.
mod. ill-behaved. : You are most illin' and you are bugging me, Kim. Stop it!
in. behaving badly. : Stop illin' and pay attention.
mod. upset. : What are you illin' about? Everything is ice.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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[il-in] 
ɪn