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2.
a little known urban sport which involves a challenge between 2 or more friends as to who can bin the most take away trays (as in the ones provided at mcdonalds) as possible at once.
"the record for traying is upto 12, think you can beat it?"
by Josh Kellett December 27, 2007
 
1.
comes from college campuses that have enough room and enough hills and good winters....

traying is like sledding, only on a cafeteria tray.... we college kids don't have room to keep a sled in our rooms, so we "borrow" a lunch tray and we're set.... better than snow disks!
My friends and I are going to go traying on the big hill tonight after the cafeteria closes.
by Little Hurd Girl January 22, 2005