In

1. To be confirmed
2. To know something that not everybody knows.

1. It's in. Meet me at three.
2 "You're in on this now. Don't tell anyone"

In

(noun) to have an in is to have entry into a conversation with a girl, which will eventually lead to getting in.. and then getting the fuck out

Yo u need a pen right? shes gotta pen thats your in.. go ask if u can borrow hers

In

Your name is probably Lina and you're doing the challenge "remove the first and last letter of your name", We love u Lina!!
(meaning: An anxious and ambiverted person, who can be really cool if their social battery doesn't run out)

You're kind of an In person!

In

Being down to do something.

A: Yo bro u wanna go to a boat party?
B: In.

In

gay sex. putting ur d!ck in another mans assh0le

omg gary you’re in!!

In

(of an outfielder or infield player) playing closer than normal to home plate.

In search of a force, they brought in the infield

In

Expressing the situation of something that is or appears to be enclosed or surrounded by something else.
Inside.

Aech put his dick in the gloryhole only to later find out there was a guy on the other side.