Informal Contractions
Informal contractions are short forms of other words that people use when speaking casually. They are not exactly slang, but they are a little like slang.
For example, "gonna" is a short form of "going to". If you say "going to" very fast, without carefully pronouncing each word, it can sound like "gonna".
Please remember that these are informal contractions. That means that we do not use them in "correct" speech, and we almost never use them in writing. (If you see them in writing, for example in a comic strip, that is because the written words represent the spoken words... | 
