A tattoo over the genitals (generally taken as female genitalia). The reverse of the tramp stamp.
"Wow a twat blot, how risque. I'm sure that won't looked stretched out and horrific after pregnancy."

"Hmm? Ah yes, the twat blot. The mark of any upwardly mobile and classy young woman."
by Whodafuckizyoo February 15, 2012
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