gerant
A gerant is a common word used in Wales by homosexual men. It refers to a rather extream sexual act in which a fist is inserted into another mans anus. This is also refered to as fisting but Gerant defines the whole sexual act as one. From the start to end. 
"I gave him an amazing gerant last night"
"I want you to give me a gerant"
"Steve gave me a gerant last night"