When two words that don't technically rhyme are said in a way that sounds as if they do. The term is named for Eminem because of his constant use of this technique in his rhymes.
Examples of Eminem rhymes:
I sit back with this pack of zig zags
Hi kids! Do you like violence?
Wanna see me stick Nine Inch Nails through each one of my eyelids?
I'd never let another chick bring me down, in a relationship
Save it bitch, babysit, you make me sick