when a woman is arched in the shape of a rainbow, and the man ejaculates all over her.

The act of performing anal sex then performing normal sex while the woman is menstrating then take the residue and fecal mater and spread it over her stomach in the form of a rainbow. Thus creating the chillie rainbow

A sore or mark that resembles a hickey on a man's penis usually resulting from sex. Can be made if he pulls out and pushes back in wrong, or from friction.

When a male bends over and shoots diarrea over a table, resembling a brown rainbow.

Is when a woman is hunched upside down on her shoulders, where she then pisses and shits on to her own face representing the pot of gold. The piss would pan out acting as a rainbow. The logs of soggy poop would soar through the air as if it were chilli.