Humor websites are a good way to practice your Portuguese, especially to see slang in context. Here are some good places to start:

• Irmãos Brain — a cartoon site about three Lego characters living outside of São Paulo
• Dr. Pepper — another cartoon site with off-color humor and bad words (featured below)
• BobAgento — a humor and “weird news” site with photos and video
• Uhull — a humor site of funny photos and videos
• Nadaver — a site with political cartoons as well as photos and video