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1.
A giant volcano of semen or urine that fires out of one's urethra. The term is applicable to semen from a man's urethra or urine from the urethra of a man or woman, However, it is most commonly used in the context of semen erupting from a man's urethra during a strong ejaculation.
My girlfriend sucked me off so good that my uretheruption literally pushed her eye into her skull.
by carolizer March 09, 2012