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when ur mouth or jaws get stuck open after giving head
or very hardcore sex.
Basically its the same as a rim jaw.

she was in the hospital due to a terrible accident w/ her japper jaws -ha ha- she had a jaw lock for 2 hrs str8!
"U'R such a Japper Jaws" --ha ha
by miss G'(ya'll kno') July 15, 2006
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