An incext is a sensual, risque, or sexually explicit text message sent between two people who are related. The incext is the result of the act of incexting, which is sexting (sending sexy text messages) between two people who are related.
I myself have been discovered to be sending incexts to my mother.
Sandra: "Hey all. I was talking to Ted's sister the other day. She said she found Ted was sexting some woman. Ted's sister briefly stole Ted's phone and copied and downloaded all of the messages. She printed them out and showed them to me. Ted was sexting with his mother, so all of those messages were incexts."
The ones Sandra was talking to: "No freaking way. His mother??!! Oh wow, hehehe"
Sandra: "Ha ha, Ted will have some explaining to do next time we see him."
A guy in the group: "Really Sandy? Come on. I mean what explanation is there other than exactly what it looks like."
Sex with someone with a familial relationship, but no bloodrelationship. Sometimes treated as incest in the law, but not as much of a taboo subject in common society.
"Dude, she's not my mom! She just married my father."
"So that's pseudo-incest. Still illegal in this state."
When someone farts into another persons butt. The other person mixes the fart around inside them, then farts it back out. It is a fart within a fart.
Sharon: "baby, I want us to move our relationship to the next level...I think we should create something together."
Ben: "I love you Sharon, but I don't think I'm ready for kids yet."
Sharon: "kids!? No! I want us to make an inception fart!"