from the internet:

We have what seems to be a simple,
certain cure; at least it has been
effective for family and friends for the
past 40 years.
Simply close the jaw firmly with the
lips pressed together. Breathe slowly
through the nose – taking a good three

seconds to inhale, then the same again
to exhale. Do this until the hiccups have
stopped, perhaps continuing the
breathing through the nose for a short
while to be sure.
The sooner this is tried after the spasms
start, the quicker it is effective – but
even in longstanding

prphik prphiccup