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The phrase "You tell em" is one of many sarcastic remarks which can be used to abruptly end a conversation. If you do not feel like responding to a certain person or your laughing at a complete idiot/moron/goon throwing out a "You tell em" will shut them up or induce a very interesting response.
Complete Idiot with glasses- "Actually Mr. Peeeeuuuurrrrd, I ate 7 apples for breakfast, not 6."

You- "ay you tell em pal"

A moron is walking in the hallway talking to his friend who is even more of a goon.

You- Point and say the famous catchphrase "You tell em" Then walk away.
by Steve Santang April 14, 2009