How to not get special characters in place of meta key combinations for VIM on OS X

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On OS X, at any program, when I type option-p I get π, option-P I get and there's a bunch of alt/option bindings that just return greek and other special characters.

Is there a way to disable that?

Currently I'm using the Auto Pairs VIM plugin and it has the following default mappings:

<M-p> : Toggle Autopairs (g:AutoPairsShortcutToggle) 
<M-e> : Fast Wrap (g:AutoPairsShortcutFastWrap) 
<M-n> : Jump to next closed pair (g:AutoPairsShortcutJump) 
<M-b> : BackInsert (g:AutoPairsShortcutBackInsert)

It seems I can't use these and other meta key based VIM mappings while this special input is turned on.

EDIT

From this cnet article, in truth I need to know how to disable that special input shown at the bottom of the page.

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