Prefix? ど can emphasize the meaning of the word, and it is more common in Kansai.
One should be warned that this prefix has a certain rude/older man feel to it and should only be used if one knows what they're doing.
Common uses:
Grammar elements:
Example:
| Standard | Kansai-ben | English | 
|---|---|---|
| 頭(あたま) | どたま | head | 
| あほ | どあほ | idiot | 
| えらい(すごく) | どえらい | very | 
| きたない | どぎたない | dirty | 
| 根性(こんじょう) | ど根性(どこんじょう) | moxie/guts | 
| すけべ | どすけべ | dirty/creepy | 
| 迫力(はくりょく) | ど迫力(どはくりょく) | power; oomph | 
| ぶす | どぶす | ugly | 
| 真ん中(まんなか) | ど真ん中(どまんなか) | center; bull's eye | 
| Standard | 今日はものすごい雨だなあ。仕事行くのいやだなあ。 | 
|---|---|
| Kansai-ben | 今日はどえらい雨やなあ。仕事行くんいややなあ。 | 
| English | Geez, it's raining so much today. I don't wanna go to work. | 

    
Commentary:
The characteristics of ど I
In general, ど is used with negative words, not positive words (such as きれい).
However, there are some exceptions. For example, えらい (in the sense of "very") can take ど.
The characteristics of ど II
ど is often used in abusive language.
頭をぶんなぐってやるぞ!
どたまかち割ったろか!
The characteristics of ど III
The ど-prefixed words which have a neutral meaning, such as ど根性, ど真ん中, and ど迫力, are commonly used even outside of Kansai.