Not gonna lie

A term usually found in Rochester, NY and usually used as a sentence enhancer much like you might use the term "I'm dead serious"

A phrase used to communicate that the associated statement is candid, honest, and open. It is commonly used among hipsters and those in our culture assigned to defining what is cool, reaching the pinnacle of its use in late february of 2010.
"her makeup is out of control, not gonna lie"

A term that when prefixed to a statement does more damage than good. Its purpose is to state that you are about to tell the truth about something. However, If one has to use this statement, it can be concluded that when that same person does not use this statement then they are lying, because when they are telling the truth, they state that they are about to tell the truth by saying, "I’m not gonna lie..."

So this statement, in effect, when used, devalues any potential credibility one once had as an honest and truthful person when they are not using the statement.

It is synonymous with: to tell you the truth, honestly, actually, as a matter of fact, in fact , truthfully

I phrase used to add to any sentence which you never need to lie in.

A statement normally used to express the fact that you aren't going to lie about the next statement.

A four word variation of the words "honestly" or "truthfully." A statement in which the speaker announces that he or she does in fact tell the truth.

One of the gayest expressions commonly used today. Often used before stating something obvious or something that no one would bother to lie about. This expression is over used and almost always makes the user look like a douche.