It means the last time the user (whose profile you are checking) had accessed WhatsApp. It may not always be right (Android users report problems where they appear online 24x7).
There's no working method available to hide the last seen timestamp on WhatsApp. May be the next WhatsAp update will bring in a feature to do that.
To hide your last seen status and online presence on WhatsApp, go to Settings > Privacy. From there, you can select Last Seen and set it to Nobody or My Contacts (if you want only select contacts to see it). Additionally, you can disable the Read Receipts option to prevent others from seeing when you've read their messages. To remain completely hidden while using the app, consider using Airplane Mode to read messages without appearing online, but remember to reconnect to the internet afterward to send messages.
The person either has you blocked, has deleted his account, or does not a profile picture on the Whats app if you can't see a picture.
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He Was Last Seen At A Burning Church.
She was last seen at Lae, New Guinea.