It’s funny, but you’re pushing it to the brink of acceptability. Originating in 4chan as the epitome of selfish, infantile demand, the exclamation “moar” serves a wonderful purpose, allowing you to ask for something without need for separate self-deprecation. It’s lighthearted and amusing.
However, it loses these qualities if you say it over and over. When it comes down to it, “moar” embraces our worser traits, and should be used in moderation and always with humility. Of course, if you’re an idiot and are also starting to say things like “I will put moar peanut butter on my toast”, you should stop saying the word as you don’t understand what it’s for and are trying to be charming through intentional misspelling.
You would like something, know you can’t offer anything in consideration, and feel selfish enough by asking that you want to come off as intentionally rude. It’s a cute face-saving measure, and that’s all it is. Don’t use it otherwise.
Please, link others here. You may also peruse the other words and phrases nobody should say or ruin.