'Cause is allowed in dialogue, when recording the informal speech of people. It is not found in narrative.
No,it is not grammatically correct.
"Not like that" can be grammatically correct, depending on the context.
We would write either "How did it look?" or "What did it look like?"
Using "we thanking you" is grammatically incorrect. A more appropriate phrase would be "we thank you" or "we would like to thank you." If you want to express gratitude on behalf of a group, you could say, "We thank you for your support."
cause if it is interesting....
No, "I like him best" is grammatically correct. It is a simple sentence in which "I" is the subject, "like" is the verb, and "him best" is the object.
you write could have in a conjunction like this couldn,t
You could listen to the sound, and write out what it sounds like to you.
The phrase "Is you don't miss me do you" is not grammatically correct. It should be rephrased to something like "Don't you miss me?" to be correct.
Cause he feels like it!
cause they freakin felt like it
It could mean something like: (Be) happy you have a good time. But it's not very grammatically correct.