A sexual act performed either kneeling, squatting or sitting, surrounded by a number of standing males in a circle brandishing their penises.
The person in the middle of the circle then proceeds with oral sex on the penises, especially wanking/jerking off 2 penises at a time to emulate the shape of a Jester's hat on his or her head.
Note: Each penis refers to one of the floppy points on a jesters hat (liliripes). A minimum of 3 is required.
"That party was banging last night. Some slut was giving me and the boys a jesters hat until we jizzed all up in her face like we just opened a tin of custard."
"sup girl. how do you feel about wearing a jester's hat for me and the boys tonight?"