WordPress at a glance
filter is not described

check_is_user_spammed filter-hook . WP 3.7.0

Filters whether the user has been marked as a spammer.

Usage

add_filter( 'check_is_user_spammed', 'filter_function_name_8233', 10, 2 );
function filter_function_name_8233( $spammed, $user ){
	// filter...

	return $spammed;
}
$spammed(true/false)
Whether the user is considered a spammer.
$user(WP_User)
User to check against.

Where the hook is called

wp_authenticate_spam_check()
wp-includes/user.php 312
$spammed = apply_filters( 'check_is_user_spammed', is_user_spammy( $user ), $user );

Where the hook is used (in WP core)

Does not used.