For males it is playing with your wang or joystick on your crotch till you ejaculate white semen. For chicks it's the same except it's their vagina.
Try this: Master of debating(say it quickly and it sounds like masturbating)
Ex: Sarah: Hey what are you doing in the room? Kevin: Well I'm masturbating to porn so don't come in. Sarah: o_O Okay! talk to you later then.
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug