When your phone or device does random things that you didn't expect to the extend that could get akward. A true butt-dial but beyond the telephone.
As I had my phone in the shower a sundden drop of water launched Instagram and initiated a video call by mistake as I quickly attempted to hang up with soaked fingers... What a Butt fail!
When an uncontrollable shit happens during anal sex.
"Omg shaniqua, I totally goofed the other night." "Guuul whatchu mean?" "Guuurrl he be puttin that rod in my stank bank and I totally butt failed
.." "Aww naw.gurl that no good."