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1.
The act of swapping positions with another in order to complete a difficult task.
Guy 1: "I can't drink all this tabasco by myself!!!"

Guy 2: "Tag out!!!"

Guy 1: "Chug! Chug! Chug!"
by Jablome Hardman May 06, 2008
 
2.
When you click outside the Facebook chat box so that no one will know you are reading their messages so it does not display the legendary

"Seen by _____".
Dave: Yo Steven, did you see what Daniel said about Wendy on facebook?
Steven: Yea homie, but I always tag out
Dave: YEEE BOYYY
by Taxi Driver August 19, 2013