Usually applied to a woman, her mouth and jaw become so fixed in the position of giving head or getting mouth stuffed that it is painful for her to shut it.
''Hey man, I railed her mouth so much that she ended up with a nasty case of the hungarian lock-jaw.''

or applied to a man

'' Eventhough she came I didn't want to stop going down on, I think I got hungarian lock-jawed.''
by The El Paso Bonerattler April 20, 2010
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