Google Buzz is tool to communicate with all your Google Profile Follower. It is similar to twitter to the some extent. If you have not yet activated your Google Buzz Account then You must learn How to activate your Google Buzz account.
Now, If you have already worked and got some experienced on Google Buzz and now want to remove it from your Gmail for some reason then you can do it within 2-3 minutes.
First of all, login into your Gmail Account then click on Buzz option on left side bar, just below the Inbox option. Then You will see your photo and followers details on the top of the Google Buzz Page. It will look like this image.

Now, You have to click on your name, for blogdefined me its Pankaj Gupta. After Clicking on your name, it will reopen the same box but with Google Profile Option enabled this time similar to the image shown below.

Now, Click on edit option. It will open your Google Profile Page. Now, See at the bottom of the page. You will find the similar option as shown in this image.

Just Click on the read line and it will delete the Gmail Buzz account from your profile and It will delete all the records related to Gmail Buzz. Please be sure before clicking on this option. It will not restore.
If you have any doubt then please post a comment below.
Related posts:
- Gmail Account Security Tips-Sign Out From Other Computer Delete All Session
- Comment and Like Tab in Google Buzz Profile Latest Change in Google Buzz
- How to Backup/Download All Contacts From my Gmail Account-Gmail Trick
- How to Change Default Themes in Gmail Account-Gmail Tips
- Did you Noticed New Top Navigation Bar in Your Gmail Account

Hi Pankaj! Thanks for the nice article it helped me for buzz!
You are most welcome Mohini..