back·ti·vi·ty \bak-'ti-vi-tē\ n, pl -ties (2011) 1: The quality or state of being sexually active/experimental with a view from the rear. 2: Vigorous or energetic action from the rear. 3: A similar process actually or potentially involving sexual function from behind. 4: An educational procedure designed to stimulate sexually (specific: Anal, Doggy, Reverse Cowgirl, blowing your load on her ass/back).
Timmy: Last night, Tiffy and I got into some crazy new stuff we'd never done before. One was like the piledriver only she was staring right up at my nuts and asshole.

Mikey: Yeah? Sounds awesome. Good thing you made those bunk beds. Now you have so much more room for backtivities.

~

Tiffy: Timmy and I tried a whole new backtivity last night where all I could see was his sack and butthole bramble patch.

Daisy: Was it any good?

Tiffy: It was definitely better than looking at his ugly schmuck mug.
by tandem double frogman April 8, 2011
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The brand of political or social activism that involves doing nothing meaningful whatsoever except for completely useless gestures, "discussing the issues" with people who already share your point of view, and flooding Facebook with activism posts.

The whole point of which is simply to make sure everyone else in the world knows how tolerant and great you are and how shitty and tolerant they aren't, while actually not making any difference whatsoever.
That Tiffany girl who is always posting 10 times a day on Facebook about how society is controlled by anti-gay, anti-feminist, anti-immigrant, poverty-hating white guys gets drunk four nights a week on her parent's dime, and sleeps around while skipping half of the classes in her Development Studies major. She's never actually contributed to the betterment of society in any meaningful way. But pat yourself on the backtivism means she still thinks she's a better person than everyone else.
by BroamChomsky February 7, 2014
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The activation of your back during lat pull downs
your backtivation is insane rn
by Succ ess December 13, 2021
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