It is the superlative degree of bhosda.
Bhosda means the reproductive organ of a female i.e vagina.
When the vagina is fucked is so hard that it becomes 2 or triple of its size then it called BUM BHOSDA.
Note : The increase in size of vagina when fucked is a theoretical concept.
Maine saali randi to kal raat itna choda ki uski chut ka bum bhosda bana diya.
by hit98 July 25, 2011
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