Verb. Illusinate is an alteration of the word illustrate. It means to shown or explain by example. It is a good example of jazz/easy culture playing on words and meanings and making things their own. Other examples include 'hip' 'swinging' and 'cat' .
"Say, this kitt cat know's where its at!"
"Knows where whats at?"
"Well little lady, let me illusinate here.."