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1.
Taking a giant satisfying crap.
After Big Bob ate all you could eat tacos at the local bar, his stomach began to gurgle and decided he'd better take a Big Grumby
by Robert McDonald January 04, 2007
 
2.
taking a large chew of tobacco.
After landing a 52" pike on his tip up, Chuck decided to take a Big Grumby to celebrate the moment.
by Robert McDonald January 04, 2007
 
3.
a disgusting looking vagina
look at her big grumby
by yardee November 12, 2007