A jokey insult to a woman. It suggests that the woman has so many penis' in her are one time, the only way she can fit them all in is to play it like a Tetris game.
Can be changed for men to "Tetris Bum Whore"
A: OMG that girl!
B: I know right! She has so many men at one time, she has to arrange them around her and fit the penis' in like tetris blocks!...the tetris whore!