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1.
One who posts about past events on social media sites in order to:

1) Insinuate he or she is better than you
2) Feel better about him or herself
Time Traveler example: "In 2013 I bought a house, met the man of my dreams, got accepted to law school and moved to Denver. Here's to an even better year in 2014!!!!!!!!!!!!"
by ajreag December 31, 2013
 
2.
A woman who appears to age as she gets nearer to you.
I thought she was 21 from the other side of the club, but after I walked up to that Time Traveler, she had to have been at least 42.
by g.f.y. February 03, 2010
 
3.
Someone that drank to the point of blacking out and looses all track of time by time traveling to a near and confusing future. Also known as the Tom Traveler.
The time traveler was drinking at the bar and ended up at a strange apartment where I was naked on the floor, with the water running.
by chadeo12 June 17, 2009