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1.
What happens momentarily to a woman's body during heterosexual intercourse provided the man is "well equipped". During penetration the kidney shifts because of reduced space in the stomach area.
"smith I get swift wit the lyrical gift hit you wit the dick make you kidney shift...shhh
here we go here we go but I'm not domino"

Notorious B.I.G. - one more chance
by BLANKZ January 29, 2008
 
2.
where by a man inserts his penis into another mans anus so hard that it shifts his kidneys
'matt came round last night, he gave it to me like a buckin bronco and gave me a kidneyshift'
by Diana Ross April 12, 2007