The monthly masturbational session most males will have that is in some way more special than the other 29, a more pleasant version of the process females will endure,menstruation.
Dave: Hey John, why didn't you come out last night ?
John: Oh sorry it was my time off the month, I rented the new girls gone wild, lubed up....
Dave: Oh, wankstruation !
Something that is that awful, ridiculous or terrible that it is beyond wanky and being a monstrosity.
Wankstrosity is a portmanteau of "wank" and "monstrosity"
"Isn't how the government is handling the pandemic a wankstrosity"
"Your mum's cooking is a wankstrosity"
"Your shagging technique is a wankstrosity, I'd rather bang a wank sock"