Top Definition
urinating with great volume, producing a considerable splash and sound.
Did you hear the one in the stall next to me...Girl, she was flat-rocking like you would not believe! I said, "Whoa, trigger, give someone else a chance here."
#wicked piss #bladder buster #drainage #fire hosing #monster piss
by flyingdog January 20, 2008
5 Words related to flat-rocking
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