:o is there anyway that i can get meat on my knukles????

Eventually depending on your body type your hand will become a lot more manly (sorry if your already an adult, I just don't know how old you are lol)
At this point your hands will fill out more, but until then, don't crack your knuckles, that's what makes them boney

Have you tried cowpunching? Sorry, a little American Old West humor. I couldn't resist. :D

Try working your fingers/knuckles