A type of sexplay that involves stimulating the urethra of a man by sticking something up it, usually instruments called sounds and sometimes a catheter. According to Foz at Fozzie’s Den, there are three types of people who are into urethra play: probers who do it just for the feel of something in their urethra; stuffers who want to stick the thickest possible rod down their penis to stretch it out; and plungers who want to go deep, past the prostate and into the bladder.