Thinkception 

Thinking about what other people think you're thinking about.

Boy: What are you thinking about?
Girl: Wondering what you're thinking about what I'm thinking about...
Boy: Whoa... it's thinkception!

Thinkception by deebs64 April 20, 2013

Twinception

Fraternal twins (one male and one female) who have fraternal twins themselves (one male and one female) who have fraternal twins themselves (one male and one female)... and so on

"Hey John, I was talking to your sister, and from your family tree, it looks like you guys had a pretty bad case of twinception, like 6 generations in-bred"
"That's no big deal, my twins might be in high school and having sex on a regular basis, and one of them have double-down syndrome, but it isn't any different than my household growing up... Like father and mother, like son and daughter i guess."

Twinception by 17link7 December 30, 2014

thinkvention 

An invention that is created only in though with no serious thought to actual development.

An invention on paper is worth ten thinkventions in the mind.

thinkvention by amarylliself June 6, 2015

Tinception 

A name for a retarded kid who tries to pick up girls online. Often called Tin for short.

He's such a Tinception

Tinception by callmefear November 6, 2018