How to remove this site may be hacked from Search Engine Result Page
Simple & Short
01. Disallow To Google Boot By Robot.txt File
02. Use Site:DomainName.com To Find How Many URL Created Or Hacked
03. Delete The Sitemap And Don't Submit It Still Issue Not Solved
04. Delete The Website And Upload The BackUp Site
05. If Website Is On Wordpress Then Delete Unwanted Plugins & Install Some Anti-Hacking Plugins
06.If You Done On This Then Again Create A New Robot.txt File & Sitemap.xml and Submit to the webmaster.