A splinter in the ass,usually done while moving from a sitting position on wood or wood-like materials. A splass is very irritating and will hurt if rubbed against.
Me:Today i was trying to scootch over on the bleachers during gym and in the process, I GOT A SPLASS!
Them:A what?!
Me:A SPLINTER IN MY ASS!!!
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi