Top Definition
YFMTS stands for 'Your Favourite Martian The Series', an amazing and hilarious YouTube cartoon series, written by Ray William Johnson, creator of Equals Three (=3), Your Favourite Martian and some other online comedy shows.
Person 1: "Oh my gosh! Did you guys see the most recent YFMTS?"
Person 2: "Episode #2?"
Person 1: "No."
Person 2: "Oh, I must've missed it. I bet it was hilarious!"
Person 1: "Yeah, it was amazing, as normal! Check it out on YouTube, when you get home!"
by Twitter- @FishieInTheTree December 17, 2011
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