Yeah, I'm not sure what's going on with that Wikipedia page.

> Reduplication is sometimes employed in verbs and adjectives to enhance the effect of them.

> 胖胖的 pàng pàng de ('quite fat') from 胖 pàng ('fat')

This is the exact opposite of how I'd understand it. Saying someone is 胖 is just calling them fat (rude), but 胖胖的 is teasing, cute, chubby, etc.