Onomatopoeic & repeated words

The Japanese language has a large number of onomatopoeic expressions.
japanese has several types of onomatopoeic expressions that describe sound or actions that repeating the same sound twice. japanese also have so many common repeated words that usually use.
hmm... nothing better then example, so here are some example:

- Guru guru : describe something spinning round and round
-Hoka hoka : describe something warm, especially warm delicious looking food
- Iyo iyo : at last
- Mada mada : describe still having some way to go before reaching the goal
- Wai wai : describe a large number of people behaving boisterously. making a din
- Waku waku: describe someone who is busting with excitement in anticipation of something, thrilled
- Doki doki: describe pounding heart
- Ira ira : describe someone who is irritated or angry because things are not going as desired