Top Definition
To greet someone in a gangster like fashion. But all social groups can use it. Kind of like what's up but way cooler.
Jerome: yo what's ill bruh

Anj: OMG he said what's ill he must be so cool.

Sam: what's ill girlies.
by Incognito mode January 10, 2014

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug