When you put shredded cheese on a plate of Doritos and microwave it. As seen in the movie Step Brothers.
James: Yo Loyd, whatchu' cooking?
Loyd: Some Step Brother Nachos
James: Can I have some?
Loyd: Fuck no, get your own.
Loyd: Some Step Brother Nachos
James: Can I have some?
Loyd: Fuck no, get your own.
by Cartah Hoffah April 13, 2015
Get the Step Brother Nachosmug.