Phrase. Means to drop soap as stated. Famous in prison movies when a man is taking a shower and drops his soap, leading him to gettin analy raped. Also mentioned in cartoon the Boondocks. There is a phrase related, "drop soap" which means to screw up and to recieve grave consenquences.

To "Drop the soap" is to accidently, or absent mindedly, put yourself in a vulnerable position. Derived from the idea that in a prison shower, if you were to drop the soap, and bend over to pick it up, you would expose your anus to rape.

When you drop the soap in prison and a mans rapes you.

To do something horribly, horribly stupid that leaves you wide open to be screwed, like in a prison shower. Screwage may be figurative or literal.

If you drop the soap that means you get anal raped in the prison shower, I know from experience

in jail, men have showers together. to drop the soap is to bend over so the man near you can give you a screw

When two men in prison are interested in a sexually intimate relationship, they decide to drop the soap so that one man can come behind like donkey and insert his schlong into the other man's anal cavity.