In your example I would say that you mean "possibly'', if so you could replace it by "I possibly gonna get out/I certainly gonna get out" or something like that.
Gonna meaning "going to", so it seems unlikely "gonna go out", it seems a bit unnatural to me. Since after "I am going to..." goes before some infinitive form (go/find) or if the verb is the subject of the sentence it would take a gerund form.
It always comes with something in addition to sentence, not in a isolated way.
Examples:I gonna go out dancing every night.
Im gonna go out fishing, and see what I can find.
There is no way im gonna go out with you.
lmao im gonna go out lookin like this.
Notice: you can see a few "I am gonna out" (and the sentence ends here.), but it only confirms that to every rule there´s an exception to it. But not in a conventional way, I think.http://www.thesaurus.com/browse/probably
See the entry "possibly"
Anyway, let´s wait for more comments.