to tell on someone is to inform his or her parent/guardian/superior/jedi that they were recently caught doing the hibbity gibbity with their cousin and are now acting sheepish.

Tells - Function: Noun; Entymology: Tell; A private message in a video game or chat client, etc, that only the sender and recipient see.

Variants: Tellstorm (A large amount of tells)

Used in affirmation or agreement to a discussion or shortened version of "I'm telling you" originated by the legendary Dennis Ononikpo.

To tell is another way of saying you’re one to talk idk where it came from but me and my friends say it all the time

Telling

In Seinlanguage, this is a sign usually indicating the status of one's relationship with a person when one is questioned. Generally the placement of a hand or hands on the face, as the hands move further up the face, the indication is a worsening relationship status.