A cost or benefit imposed on a third party by a couple having sex.
My roommate and his girlfriend's refusal to dispose of condoms properly presented a pretty serious sexternality to anyone using the sidewalk outside their bedroom window.
by Dog-sized Spider April 25, 2014
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God, and exists in the form of six coeternal and consubstantial persons:
1. The dragon (Lucifer and Satan)
2. The father (DILF)
3. The son (Jesus Christ)
4. The false prophet copier (which duplicates Jesus, e.g., Elymas Bar-Jesus)
5. The beast (Antichrist, or the inverse element of Jesus)
6. The holy spirit (the sex toy impregnating Mary)
Priest: *prays*
Have mercy upon us. O sexy, and eternal Sexternity, one God.
by tobefree July 13, 2021
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When someone shares too much information about their love life or personal affairs.
Sally filled me in on every detail of her date wtih John; she's so sexternal.
by theplace December 11, 2009
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A barely-legal, bodacious, co-ed introduced into the work force for the summer to learn the ropes of her future career, who is admired by slimy, beer-bellied, graying viagra-dependent, horny male cohorts.
"Hey, Craig, look at the set on the new summer sextern. I'd like to tap that turd-cutter."

"Gary and Craig's oogling of the sextern caused a decrease in work output all summer."
"Yeah, we will be greatful when Bambi goes back to college in the fall."
by Galony June 18, 2008
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An external hard drive that is used solely for porn.
Johnny: Hey man, my computer crashed and I lost all my porn. Do you have any that I can borrow?

Cash: Yeah buddy, I'll hook you up with my sexternal hard drive. It's got about 60 hours of goods on it.
by Champcar November 27, 2011
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