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.

taking a super massive dump in someones waiting and eager mouth

when your're really hungry and don't have your own microwave

to drop the biggest ass log ever in somebody's mouth

When a hot and bothered male pinches a loaf off into the gaping mouth of his degraded female counterpart. This is normaly washed down with a few worm shots of the males "duck butter"

to deficate in another persons (ie. partner) mouth.