The act of masturbating over top of your partner while simultaneously taking a shit on him or her. Bonus points awarded for completion at the same time
The wet, splattered butt you are left with after a high velocity oatmeal type dump. This is often the result of eating a lot after a long drinking binge. Most often splatterbutt sessions are followed by a shower and a serious scrubbing except in the case of college freshman.
After the kegger the other night we went and killed a couple of jalpeno meat lover pizzas. I spent the whole morning with splatterbutt and had to shower four times.
A variation of the word 'splattered'. It means the blood and guts were splattered or sprayed around in a messyway, particularly after a moving train hits a certain person.
The uncalming fear of what may be on the underside of the toilet seat in a public bathroom.
Someone before you may have made some porcelain percussion with their toilet muffin pasted to the seat and made a heck of a mess on the under side. You are afraid to touch the seat and lift it up! This is Splattermatterphobia!