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1.
the abundance of loose fat on ones body.
Look at all that grissle on her thighs, she may be fat but she is the sweetest person
by T J Dubz October 29, 2007
 
2.
to grissle, to eat a ton a food AND or to eat any amount of food very quickly.
dude you just grissled that burritto.
or
what did you grissle for dinner.
by David Ruiz March 25, 2008