the act of shitting in clingfilm stretched over someones open mouth then fucking the mouth and at the point of ejaculation bursting through the clingfilm giving the recipiant a mouthful of shit and spunk

This involves making a small pocket inside your partners mouth (Probably with cling film etc) then fill it with a small amount of poo. Then as you are about to bolt after fucking your partners mouth, thrust really hard and break through the poo-pocket thus filling her mouth with spunk and poo milkshake: Hence a "Hot Lunch" Simple really.

A warm meal typically eaten around noon, between breakfast and dinner.

latin: Cacatus manduco
The Hot lunch takes the Hot Carl a steamy step further. One partner uses saran wrap to make a small pocket inside his/her mouth and then fills that pocket with feces (it doesn't matter whose). After the initial set-up, the man proceeds to have sex with the poo pocket, breaking through the saran wrap at the final, climatic second to fill his lover's mouth with a delicious fusion of cum and dump, also known as "cump."
From the book: Dirty Sanchez's Guide to Buck Nasty Sex

to recieve a turd from another human.

This is a close relative of "the chilli-dog." You'll proceed to drop a deuce into a waiting girl's mouth and she eats it.

Hot embers that land in a person's mouth while smoking Marijuana, normally caused by a faulty screen (or no screen at all) in the pipe being used. Can also be refered to as a "salad shooter", however the latter term is more adequately applied to small reminants that are not burning.