J is for Jeurgh and not a lot else.

JEURGH [exclamation]
Pronunciation Jurr.
Meaning Started out as "heurgh when my finger misses the h key", but became a word of its own right. Has exactly the same meaning, though.
Usage "Jeurgh, this is a pants example sentence."
Origin Zed, May 1998.

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You have been sent to j-ul. Do not pass go. Do not collect £200.