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What is flat up?
A combination a “straight up” and “flat out”. It’s more powerful.
He flat up lied for us.
flat up - video
Flat up - what is it?
term for a type of snowboarding jib that slants upward to a flat part and then slants downward again. exellent for showing off your skills.
"Dude, I totally nailed my backside 540 on that up flat down box."