Twinnection 

a connection that occurs when people are twins and they say or think stuff at the same time

Oh my god I was thinking that too! Twinnection!

Twinnection by pmrwlrgkatljflg July 8, 2011

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

twinfection 

When you and your friend hang out with (a) twin(s) and realize you and your friends are starting to act similar.

Brady and I have the same haircut and got the same new shoes, I think we might have a twinfection.

twinfection by Ace Hubba May 28, 2016

thinfection 

It is for girl who want to become skinny obbsed like an infection but thinfection

OMG she's 99 pounds and thinks shes fat, she has a total thinfection

thinfection by MoldyDinosaur May 31, 2009