What can I do to improve rankings

For keywords like Sexy gifs sexy animated gifs

Site is hxxp://www.sm*okin*gifs.c*om

I mean should I create a keyword stuff page that redirects to the home page?

There's a lot of factors that go into ranking well for your keywords... But first things first in SEO and rankings. You've gotta build backlinks for the specific keywords you want to rank well for. Make sure the anchor text is exactly the keyword you want to rank well for. Start building up links with those anchor texts and you should see some progress. There's also a lot of onpage factors that come into play as well.