That's all I know.

A term used in the Mid-Western region of the United States, particularly Eastern Missouri. The term is used to end a gossip session or other verbal engagement between Two or more people. It is spoken when the speaker is ready to disengage from the conversation or has no further information concerning the topic of discussion. It is also a common signifier that the person using the term is done engaging in general conversation with another person.

Also, Sarah has her bridal shower and she wanted me to give you that info. Well, that's all I know.

I know who you love

What Empty!Cas said to Castiel about Dean Winchester

I know what you hate, I know who you love.

someone i used to know

In regards to an ex. Someone you used to date and probably have feeling for but no contact with.

Who's is that girl?

That's just someone I used to know.

I know.

A phrase used in a matter of fact way when someone agrees with a statement of yours. Phrase owned by Ehlimana.

Person 1: Running is necessary to get away from kidnappers.
Person 2: True.
Person 1: I know.

I Know its Over

The greatest song of all time

I Know its Over by The Smiths is the greatest song of all time