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A shamewank can be defined by the distraught feeling you get after masturbation, knowing that your belly is covered in cum having thought about the most disgustings thing ever.

Examples of these are:

Your dog
Your cat
Your best friends girlfriend
Your best friend (Same sex)
Your mum
Your sister
The 80 year old woman down the road
Dead people
I caught young billie havin' a damn shamewank last night. Motherfucker had a picture of your sweet grandma in his left hand, while he beat his man meat and spunked on her glass covered pretty lips. Motherfucker!
by Ashamedbuthappy October 23, 2009
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When you wank for so long and you have used up all your acceptable wank fantasies. You must then journey to the dark side of the wank, which is full of all the good looking people just too young to go out with in school.
Oh shit, there goes my last valid wank fantasy. I should stop before this turns into a shame wank.
by ShammyDooWop August 23, 2016
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