ass-splitter Share definition Flag 1. A cock of exceptional girth and rigidity, esp. one used to deliver a merciless fuck in the anus My brother said he couldn't walk for a week after Carlos fucked him, 'cause Carlos was haulin' a real ass-splitter. ass-splitter by Edmond Dantes April 26, 2006 0 0 Get merch Get the ass-splitter mug. Buy Now — $32.95 See more merch