Top definition
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."
by boardsport7 January 26, 2008
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug