When a guys pisses dual streams out of his penis. Generally, said individual has dried ejaculate on the tip of his dick causing such effect. The effect is short lived as the stream will weaken and dissolve the dried spunk. Named after the popular spark plug model.
Dude 1: Control your piss, it's getting everywhere.

Dude 2: Sorry man, I have a splitfire going on here.
by The Traxmaster2 January 07, 2012
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