Backdoor S'more Share definition Flag When a guy pours chocolate on his penis, proceeds to have anal sex with someone and ejaculates in their anus. She said she wanted to go camping, so I gave her a Backdoor S'more by the fire. Backdoor S'more by Kathryn Obvious August 31, 2018 0 0 Get merch Get the Backdoor S'more mug. Buy Now — $32.95 See more merch