Akin to the "Cleveland Steamer" a Cincinnati Hotplate is when one person lays under a glass table while another person straddles the table and defecates on the table, giving the "receiver" the fecalphiliac thrill without the mess.
See also "Stallone"
"Sylvester Stallone was a big fan of the ol' Cincinnati Hotplate. He'd pay big bucks to have hookers drop a deuce on the table while he spanked one out to it. Sick!"