Cracked unspeakable jokes? (6)

I believe the answer is:

gagged

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'cracked unspeakable jokes?' is the definition.
The answer and definition can be both to do with contact as well as being past participle verbs.
Maybe you can see a link between them that I can't see?

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(Other definitions for gagged that I've seen before include "Silenced" , "Not allowed to speak out" , "Muffled or retched" , "Struggled for breath or prevented from speaking out" .)

I've seen this clue in the Evening Standard.

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