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It's similar to a kerb stomp.

You put someone's face against a kerb like if he was kissing it and then you hit him in the back of the head. Bloody and potentially lethal.
In the book the City and the City by C. Miéville :

" A young man called Avid Avid left bleeding from the head after taking a kerb-kiss from a racist..."

A scene at the beginning of American History X where Edward Norton totally gives a kerb kiss to a guy.( He kills him and then goes to jail)
by Ababakar November 07, 2010
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Jul 22 Word of the Day
Short for ultimate bias. Typically used by fangirls and fanboys to describe their favourite celebrity amongst the many that they are fans of.
G-Dragon is my ult
by Uglycat February 19, 2017
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