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to describe something that is so sweet, that the words "ill" or "sick" just wont do. Illy is a word that comes from latin meaning "so fresh it's out of this world".
Daniel: Yo did you just see that Honda CRX

Mike: yeah that car was illy, ya dig homie slice.

Daniel: yeah that car was so illy!
by Ace Dace March 06, 2011
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10
Slang term for a bong, specifically of the brand "Illadelph"
Yo, lemme hit the illy.
by BoofAss November 16, 2015
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11
A cigarette which is dipped in Fermaldahyde solution, which when smoked, contains a form of PCP.
wat's the dilly? let's smoke sum illy
by Austin February 14, 2004
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