A Dellinger Special is a sexual act where one party shits in the shower while the other party watches. This is popularly done in BDSM and is perceived as a portrayal of dominance. This term is native to Trinidad and is considered slang.
P1: I heard Tays and Stella were going to do the DellingerSpecial.
P2: No way, I've been wanting to try that
a variation of 'mooning' someone, but done from inside an automobile with your testacles pulled behind your legs into your butt-crack and pressed up against the inside of the window glass. Looks quite offensive.