The first documented thread derailed by the “Good Happy” meme was on 3/14/13. A sculpting artist posted a thread to share the crafts s/he had made, when an Anon posted an illustrated template of the ‘cool guy’ with the phrase “come at me, bro” captioned above. As the thread progressed, so did the quantity of “Good Happy” images with different captions and even a variant of the Feels Guy meme.
Any reasoning behind this meme is currently unknown. It is assumed that the term “good happy” refers to enjoying one’s self and having fun. The meme very well could be an extension of the “Cool Guy” but obviously has a different effect, entirely.