In the ethnic gay world, "cookies" is a word that could be used instead of 'ass'. "Eating Cookies" means that a person's ass (usually a male) is made love to with a tongue in preparation for anal penetration.
"Eating Cookies". He wanted to stick his cock in my ass but we were all out of lube. If he wanted to slip inside of me, he was going to have to get me soft, wet, and relaxed. I told him that he would have to eat my cookies first.