busca-categorias or busca-tags

$meta_query = array(
	'relation' => 'OR',
	array(
		'key'     => 'busca-categorias',
		'value'   => 'valor_aqui',
		'compare' => 'LIKE',
	),
	array(
		'key'     => 'busca-tags',
		'value'   => 'valor_aqui',
		'compare' => 'LIKE',
	),
);