A really dry flatulence which upon exiting the anus emits dust which then can be seen on the inner lining of the undergarment as a powder like substance which falls away upon removal of said undergarment.
Hey Bill, check out my collection of fart dust I have here in this jar. It weighs almost 10 pounds!
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A tonic derived from ones cock!
Carl! Why are you drinking that shit? It tastes like Cock Tonic ya fucking Cock Tonic drinking fuck!
When one has a really wet flatulence which leaves a slushy brown substance in ones undergarment.
Man you should change your boxers there is fart slush dripping down your leg!
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You can masterbate with left or right hand.
"Adam... You are masturbating with your left hand I thought you were a righty?"
"Nope... I'm ambimasturbatrous!"
"...What?"