Short for Sexually Active.

An active participant in sexual activities.
Me: "My girlfriend and I are sactive as of yesterday"

Friend: "What do you mean?"

Me: " It means we're Sexually Active dumb ass!"
by dominasty August 1, 2009
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Activism performed yielding the nutsac.
Person 1: How's Sactivism working out for you?
person 2: Yeah, I'll put my nutsac back in my pants when you bring the troops home.
by Xray Cadberry August 23, 2009
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