This is going to be expensive. Here is the complete rundown. Let me know if I missed anything. I certainly hope not

Pielover855 6 pies face, sandwich, crotch, sit, hat
DinnerKnickers shaving foam in underwear
PieCanvass bucket of slime
Train1987- 50 liters of gunge (closer to 20)
SploshD flip coin 19 times, 12 heads 12 pies
Shinyrainwear porridge facial and shampoo
Subadubdub pie with 3 filling's chocolate vanilla and cherry
PieCanvass again rainbow cake frosting on face
SploshD again sprinkles on the rainbow frosting
Thefetishgirl 1 cake face and 1 cake sit
BlueGriffin fill taped up disposable coveralls with the birthday mess
SploshD again Chocolate syrup in Top with waistband and then open waistband to go into shorts
FatPieFan with a jam shampoo

Subadubdub again sent me to the no reply zone for my birthday where
SploshD gave me 4 chocolate pudding balloons to pop over my head
Subadubdub with cheese sauce in my underwear
Novagunger with a human cake
TexasBeau with nacho cheese sauce on my head

Whipped cream and I'll let you decide

Whisk/Beat 4 eggs in a bowl. Coat your torso, arms and legs with the beaten eggs. If there's any leftover mixture pour it over your head. Next take some regular flour and cover yourself with it.

Tex you get hit with eggs, warmed marshmallow fluff, choc syrup and sprinkles or rice crispies, and given why you are doing this I trust you will be in your "birthday suit"