Top Definition
Massive Mud Butt Build Up

Holding on to the Mud Butt sensation for too long!! Only to discover when you finally get to the toilet poo explodes out of your anus everywhere! You may uncontrollably Shart yourself in the process.
Ah shit i've got! Mud Butt... 3 hours later..... Holy fuck MMBBU, i'm about to explode!!
by steviemac11 June 01, 2011

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