A (hopefully) fictional term spawned off of the word 'incest' and the last name of those included to describe the sexual antics and/or
smutty antics of two brothers, Gerard Way and
Mikey Way.
The only places I've seen
Waycest are on www.fandomination.net/ musicians/mychemicalromance (Take out the spaces, they wouldn't let me put in an entire URL). Follow the links and soon enough you'll find my examples.
Nikki: One thing a
straight person never wants to read:
Waycest.
Sarah: But doesn't it turn some people on? Nay, give them orgasms in front of their computer screens?
Nikki: DAMN IT YOU'VE GOT TWO BROTHERS RAMMING INTO EACH OTHER, NO DECENT
STRAIGHT PERSON WANTS TO READ THAT!!
Sarah: But who said we were all straight?
Nikki: ...good point. I'm off to read high school smut between Mikey and Frank.
Sarah: That's no different than Waycest besides the fact that
Gerard's being replaced by Frank!!
Nikki: I DON'T CARE, THEY'RE NOT RELATED!!!!!