When a friend becomes a best friend then a boyfriend from sending talking videos one night on snapchat with a cup down their top and shorts. The two people then might decide to call themselves cup twin.
Some one with small muscles and a small penis who dresses and acts in a manner in which one would think they are strong, but in fact are weak little bitches.
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