the floor is wet

A slang in prisons across US that is implying on nearby guards that are coming to search and/or check on prisoners. It's used between inmates to warn each other of upcoming possible guard.
Is also refereed to as "the floor is soaking wet" or "the floor is really wet" which means that C.O.'s know something is up, and the inmates should really hurry up with covering up any possible "unacceptable or illegal actions".

*THE FLOOR IS WET* screamed an inmate as he warned his inmates from possible danger.

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