Based on the precept that even the most mundane of utterances can blow minds with proper timing, the Sweet Georgia John is a sex act wherein at the moment right before your partner begins to climax you make a completely trivial comment. Just as he or she is about to orgasm you say something like "oh, by the way - Tom says hi" or "don't let me forget to take out the recycling." Any statement of relatively very little importance which would generally be voiced only in passing will suffice. Although potentially distracting, the manuever is intended neither to diminish nor enhance the experience of the orgasmee. Rather, its purpose is to render your partner's climax bizarre or surreal in light of your flippant remark while engendering an overall sense of trippiness. When performed by a female it is also known as a Sweet Georgia Jane.
I gave my girlfriend a Sweet Georgia John when I waited until the precise moment just before she started coming to compliment her on the new drapes.