Im a dude i have a kidney stone its 2mm big. can i masterbate with it in me, its still passing ? will it hurt if i do masterbate before it passes?

Yes: That is a relatively small stone. I would not let it change the way you live your life. It should not hurt anything.

Should Be OK: Masterbation should have no effect on the stone passing down the ureter. If it helps to relieve congestion of the prostate gland (the source of much of the ejaculate fluid), then passage through the prostatic urethra might be a little easier.