bp_activity_action_my_groups_feed()

function bp_activity_action_my_groups_feed() {
	if ( ! bp_is_active( 'groups' ) || ! bp_is_user_activity() || ! bp_is_current_action( bp_get_groups_slug() ) || ! bp_is_action_variable( 'feed', 0 ) ) {
		return false;
	}

	// Get displayed user's group IDs.
	$groups    = groups_get_user_groups();
	$group_ids = implode( ',', $groups['groups'] );

	// Setup the feed.
	buddypress()->activity->feed = new BP_Activity_Feed( array(
		'id'            => 'mygroups',

		/* translators: Member groups activity RSS title - "[Site Name] | [User Display Name] | Groups Activity" */
		'title'         => sprintf( __( '%1$s | %2$s | Group Activity', 'buddyboss' ), bp_get_site_name(), bp_get_displayed_user_fullname() ),

		'link'          => trailingslashit( bp_displayed_user_domain() . bp_get_activity_slug() . '/' . bp_get_groups_slug() ),
		'description'   => sprintf( __( "Public group activity feed of which %s is a member.", 'buddyboss' ), bp_get_displayed_user_fullname() ),
		'activity_args' => array(
			'object'           => buddypress()->groups->id,
			'primary_id'       => $group_ids,
			'display_comments' => 'threaded'
		)
	) );
}