Non-Twins 

The term used to describe two babies born at the same time but are not identical. They do not come from the same egg and therefore have no right to call themselves twins, or even "non-identical twins". They are simply useless freaks of nature.

Unlike identical twins, which are amazing, miraculous human beings.

"Hey have you seen Jenny's new babies?"
"What the non-twins?"
"Yeah those little freaks."

Non-Twins by Charbot November 10, 2004

Non-zygotic Twins 

Relationship between two people who share no common genetic material but who share eerily similar mannerisms, speech patterns, behaviors and/or appearance

"Are you two brother and sister??"
"What? No! We are not at all related "
"Well you're definitely non-zygotic twins then , because you act so much alike it is freaky"

Non-zygotic Twins by Magster Dragster November 17, 2016

Non-Twin Twin 

When you're the older brother to a sister three years your junior and, due to development timeline differences, you end up resembling twins your entire life. Oftentimes this phenomenon results in common themes present in actual real life twins. Twin telepathy, for example, is one of these anomalies and is described as one twin being able to access the thoughts and feelings of the other twin without any signs or prompting.

Her: hey Tom, what's that movie where -
Him: The Princess Bride, for the 7th time ?!?!?!
Her: thanks! Was stuck in my head...

Her: hey! do you want to ligh-
Him: Light up? I have a J prepped waiting for you to ask
Her: word! I've been hustling my ass all day and
Him: And you ran out two days ago... yeah, I know. I gotchu sissy
Her: Preciate' it Non-Twin Twin

Non-Twin Twin by TDiesel December 16, 2019