An explosive expletive (5)

I believe the answer is:

blast

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'an explosive expletive' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?

This is all the clue.

Can you help me to learn more?

(Other definitions for blast that I've seen before include "Severely criticise" , "Mild expletive - sharp explosion" , "Strong gust of air" , "Severe reprimand; strong gust" , "Blow up with explosives" .)

I've seen this clue in The Guardian and The Globe and Mail.

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