termmeta.php

function hm_add_term_meta_query_support( $pieces, $taxonomies, $args ) {
	if ( empty( $args['meta_query'] ) ) {
		return $pieces;
	}

	$meta_query = new WP_Meta_Query( $args['meta_query'] );

	$sql = $meta_query->get_sql( 'term', 't', 'term_id' );

	if ( ! $sql ) {
		return $pieces;
	}

	$pieces['join'] .= $sql['join'];
	$pieces['where'] .= $sql['where'];
	
	return $pieces;
}

Usage:

get_terms( 'ticker', array( 
    'meta_query' => array(
      'key' => 'is_etf',
      'value' => '1'
    )
) );