The sign for "full" depends on your meaning.

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FULL:
The general sign for "full" is made by extending the left closed hand.  Open your right hand and move it over the top of your left fist.

 

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Note: if you reverse the motion and you move your hand forward (instead of backward) instead of meaning "full" the meaning changes to "enough."

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See: ENOUGH

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FULL-of-food / "stuffed"

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FULL-fed-up:

"I'm fed up with it!"
"I've had it up to here with you!"