If it fits your macros, then by all means.
Even if it doesn't, you have to treat yourself sometimes. Dieting and bodybuilding is about more than being ripped and lean; it's about general health -- which includes emotional health.
Like people say with refeeds, one day of eating over your maintenance calories isn't going to make you fat. Especially if you've been running a fairly heavy deficit and sticking to your diet, then I think you deserve something that isn't lean or completely productive for the body. While it may put you back a few hundred calories and 30g saturated fat, who really cares? In the long run, those occassional "cheat meals" are what will keep your satiety under control so that you can not only stick to your diet but feel good about it.
Besides, if you don't give yourself that leniency then you're just going to stress out about the foods you want to go nuts on. Which is the lesser of two evils? One 800 calories, 60g fat unproductive meal? Or, a week stressing out thinking about?
In my opinion, the leaner you are the more consistent you are with your diet, the more leniency you should give yourself in breaking your diet. I don't mean cheat every two days, but I think once a week to have a cheat meal or add cheat elements to an otherwise healthy meal.
For instance, while to some a cheat meal might be cake or McDonalds, to me it would be something like:
a toasted bagel sandwich with..
-multigrain bagel (300 calories, 60g carbs, 1.5g fat, 4g fibre, 12g protein)
-3 eggs (210 calories; 15g fat (6g saturated), 18g protein)
-some cheddar cheese (let's guess at 120 calories; 10g fat (8g saturated),
6g protein)
-4 strips bacon (cooked = 100 calories; 10g fat, 12g protein)
-organic greens
-organic roma tomatoes
-1 TBS becel margarine (70 calories; 8g fat (2g sat)
So, as you can see, there's some extra fluff to an otherwise healthy meal. However, even the "unhealthy" content has some good to it. It's just not 100% ideal. That, to me, is a cheat meal. And, because it's not absolutely terrible, I might on the same day do another similar meal (similar in that it will be primarily healthy with some non-ideal additions).
This would be a bit counterproductive to my cutting goals, but if done right you can use cheat meals to keep your willpower going steady.
As the saying goes, everything in moderation.