It is the worst sin ever to be made. If you do this you will go straight to hell. Don't even try to hold the hand of another sex before marrying them. In case you accidentally do this, you must marry the person you committed this sin with or must kill yourself
(Important-used as a verb rather than an adjective): The act of having sex with someone before taking the wedding vows. Used in same context as 'fuck' but implying the additional sinful conditions noted above.
A Pegasister is a female person who is a fan of the TV series named My Little Pony: Friendship is Magic, typically at the age of 13 or older. If you're male on the other hand, you would be known as a Brony. The plural for this term is Pegasisters, and the plural for the male term is Bronies.