when you take shit so bad that it hit the water so hard you get shit-water splashed back on your ass-hole....
my sister took a tidal wave poopie and had her legs open and she bent over to take a crap or to look at it im not really 4 sure and then the water splashed in her face!! :)
by Sara Thomas December 5, 2007
Get the tidal wave poopie mug.