I babble a bunch of driven that i don't even mean

Obama?

Lots of things promise to be funny but when I let them out they are just plain offensive... like little verbal imps.
It usually happens when the first words are already out before I've been properly notified what the end will be.
Might look on ebay for a stronger filter

I don't know if it's normal or not but I do often times catch myself singing weird, gibberish, drivel songs around the house when I'm alone. My Siamese cat seems to like it!

Whats the difference between an American BBQ and a Muslim BBQ?

In America humans cook animals on a fire.
At a Muslim BBQ animals cook humans on a fire.

whoops...did I just say that.

It's a side effect of the brainwashing imposed on you by the media and your loving family. It's likely that the things you say are thoughts learned early on in life that stick with you on a subconscious level. The only way to fight it is to immerse yourself in diversity. I bet you notice these errors more when you're amongst the people who are most likely to get offended by them, right? That means it happens more than you think, but you don't notice as much around people who accept these statements and beliefs. You may even indulge in these statements around the accepting people, thinking of them as innocent jokes. It doesn't mean you're racist or anything, but you should try to eliminate stereotypes from your mind as much as possible.

It happens, I too have experienced this phenomenon