While taking a lage dump, and it is too big to push out completely, you can cut it in half with your ass blades (aka anus).
by Devon+Susan May 07, 2006
A device commonly used in prison for the prevention of anal rape typically constructed of broken lunch trays fastend to the end of a writing or eating utensils that is then inserted into the anal cavity with the sharp end pointed directly out of the canal.
"Yo, you got dat ass-blade?" "I'll trade you ten cigs for dat ass-blade." "Jimmy, Big Dom come see you last? Yeah, he on it every night by now. Shit, you need to get dat ass-blade."
by Motorboat and a Mohawk February 24, 2014