From the verb to "Tangy" To screw over or fuck over either someone else or yourself.
Origin: From the infamous 21st century scumbag
James Bernard Tangney who was renowned for fucking over everyone and
generally being an unpleasant
influence on people's lives and his own.
Use: Ruaridh was in the bathroom when James rubbed the end of his pecker on Ruaridhs drink. He really tangied Ruaridh through this action.