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1.
the act of rolling on the grass in a soccer game to waste time. This motion (not technique) is performed by players to make the referee believe that a foul has been committed or that they are injured. Most referees consequently give precious amounts of late-game time for these "grassrollers" to gather themselves up. It is completely unsportsmanlike and annoying. Most frequently used by Arab countries (top 5 best countries at GR'ing: Qatar, Bahrain, Oman, Saudi Arabia, UAE and Syria (tie)), and the grassrolling is usually performed against the team of the Islamic Republic of Iran.
That Qatari just fell and started grassrolling for no reason.

Bahrain beat Iran 3-1, and set a record at grassrolling by wasting a total of 79 minutes in the game.
by PFDC November 06, 2004
 
2.
The act of rolling your pot leaves into smokable sticks.
"Roll Roll Roll your dope, twist it at the end...
"Light it up and take a puff and pass it to a friend."
*sung to ROW ROW ROW YOUR BOAT*
by Punkhead June 02, 2005