Q:

Saying a word in a way that describes its meaning

Is there an English term that is used when one says a word in a way that somewhat describes what it means? 
For example "Peter was really ANGRY at you Damien!"... 
Here, large emphasis would be placed on the word Angry, it would be said in loud, bold tone, face crumpled and eyebrows cross. 

Also is there a term that means when the name of a font is said, for example the font "Joker" - that the way one says the font name emphasises what the font is visually like? 
For example with the "Joker" font, I would say it with light tone bouncing on the syllables: "Jo-Kerrrre". 

A:

For the spoken word, in linguistics, intonation is variation of spoken pitch that is
  not used to distinguish words; instead it is used for a range of
  functions such as indicating the attitudes and emotions of the speaker
  ... focusing attention on important elements of the spoken message ...

{Wikipedia}
This obviously covers the required sense, but perhaps isn't specific enough (shouting 'Quiet!'  would certainly focus attention on the demand). 
'Self-referential' may be deemed more appropriate.