cranking a fat shit
When your taking a dump but the poop is so big it hurts your butt hole when pushing it out.
Friend:*knocks on bathroom door*
Me:Wait a minute I'm cranking a fat shit out of my ass.
Friend:Understandable have a nice day.
Me:Wait a minute I'm cranking a fat shit out of my ass.
Friend:Understandable have a nice day.