The worst mental illness there is
Thomas: hey, what is that mental illness you told me you have?
Kadri: I am Estonian
Thomas: Holy shit get the FUCK away from me!
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When a man spreads the woman's vagina flaps and attempts to stick his head into it. This normally ends up with a trip to the ER as it is not safe for both genders. This can be done with the same sex (see Finnish jackhammer).
Brian: "so I gave Sandra the Estonian jackhammer last night!"
Andre: "is she ok?!?"