Top Definition
A girl that ACTS like she is good in bed, only to find out she just lays there like a MATTRESS!
I was out with my new girlfriend last night, and she kept bragging about how good she was in bed and what she was going to do to me. I found out later that she was a mactress!
by Fudwumper April 06, 2011
1 more definition
The female version of the phrase "Mac-daddy"
'Dude she was pickin' up on all the guys, being the mactress that she is'

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