Well, there's more body language than actual speaking in jail. Example - dropping soap is a coy way of saying you want vicious, multi-partnered buttsecks. Then there's sitting on the bleachers which is a more direct way of saying you want vicious, multi-partnered buttsecks. Then there's jumping the queue at mealtimes which means you will take either a shank to the gut or vicious, multi-partnered buttsecks depending on which is handiest.