(Verb) when two humans rub assholes in a sexual manner, causing a suction effect between the two rimholes. The separation of the two rims causes both parties to involuntarily lose bowel function, and bowel contents in a violent shit explosion. Both participants may or may not choose to celebrate by forming poo-angels afterwards.
“Yo, Alex... How’d ya date go on the weekend?”
“Dude it was sensational! Took part in my first Tibbering session! It was exhilarating and extremelypleasurable... I would recommend the poo-angels straight after!”