multi_meta_query

$meta_query = array(
	'relation' => 'OR',
	array(
		'key'     => 'color',
		'value'   => 'blue',
		'compare' => 'LIKE',
	),
	array(
		'key'     => 'color',
		'value'   => 'red',
		'compare' => 'NOT LIKE',
	),
);