When a man dips his penis into unlit napalm and proceeds to stick it into a woman's vagina or rectum, or a man's rectum, pulls out his penis, and then lights the given orifice on fire, effectively incinerating the receiving party from the inside out.
The act of not bathing in a week and smearing duck butter on your dick, then sticking it in a woman’s vagina while on her period and then having her suck it off.