Tits that are either: very dry, are very callused, are rough or any combination of these. Desert tits are like sandpaper to the touch and can cause severe dehydration to all indulger's. You can compare the feeling of these tits to a rough leather jacket. These are not the tits you wanna be around.
"Dude, i hooked up with this chick last night"
"awe man how was it"
"dude she had desert tits, my face is raw as hell!"