When your poop is so big it sticks halfway out of the water, like the famous photograph of the Loch Ness Monster
Yo, Harold! Come check out the size of this Messy Nessy before I flush!
(noun)- a turd of mythical size. The base stays hidden in the bowl, while the head is the only thing that is seen. If you do not snap a picture of it....people may never believe it happened.
In addition to its length, circumference, and overall gargantuan stature, these often become what are also known as "bowl stainers." Leaving behind a mess that...well...isn't human.
Brother: Dude, I just took a two foot bowl stainer and no one was home to see it.
Other brother: I don't believe you.
Brother: Damn! Another Loch Nessie Messie....
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A messy Nessie is when your poop is so long that one end of it is sticking out of the toilet water like the head of the Loch Ness monster
That messy Nessie was so long that it almost touched my butt
When left with no other option, one hastily rushes into a lake to let go a mythically proportioned shit. Resulting in a bobbing turd monster that people confuse as a cryptozoological beast.
As I was running with my toddler to my mother-in-laws house to dedicate, I was left with no other option than to jump in the lake and let loose a messy Nessie
When your homie smells like 3 day old bong water.
"Damn, Sharon over there smells like a hot messy nessy!"