what does "grab a handful" mean?
i saw this phrase in the last episode of The Big Bang Theory this season, the original sentence is "We're gonna have to work as a team!
Get in here, grab a handful, and start stuffing!"

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To take a handfull (v): to take a amount of something about the size of your hand. "Cook a handful of french fries", "I'll take another handfull of chips, please."

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What were they doing on that episode of the Big Band theory? 
What were they stuffing?