Top definition
The act of having sexual intercourse while in the same house, apartment, or general building of parents or family members.

'OMG, dude I totally pulled off a z-score last night with my gf. It was crazy! my heart was pounding.'
'Aw, man. I totally Z-scored ths moring, my parents were in the next room!!"
by Twisted Sisters April 13, 2008
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