When two gay men are having sex and as one of the men is about to insert his penis into the others ass the one recieving farts really hard on the head of the others cock and it makes a hissing noise.
"Greg and I were about to engage in butt-sex but he pulled off the Hissing Snake."
Someone who jumps from one relationship immediately into another one.
Serial monogamists can not stand to be alone and often suffer from vast commitment and insecurity issues.
Because they jump into relationships immediately after the previous one has ended, serial monogamists typically don't take the time to reflect on their behavior or why their previous relationships failed; thus, they end up making the same relationship mistakes over and over again.
Person 1: Damn, Dustin already has a new girlfriend?! It's only been two weeks since he broke up with his fiance! I think he's a sociopath.