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.
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Tiffy: Timmy and I tried a whole new backtivity last night where all I could see was his sack and butthole bramble patch.
The various and sundry goings-on during the wee morning hours in the inner city. At 3:00 AM, this can range from watching the traffic passing by from lawn chairs on the sidewalk to walking to the corner mart with a five-year-old in tow, to hanging out at the barber shop - which is still open, to engaging in or avoiding interaction with members of the municipal police.
The bars are closing and i don't feel like going home. Hey, I know- let's drive through downtown and check out the blactivity.
Jen: I just want to eat a whole gallon of rocky road right now!
Alex: No way, such a bitivity. You'll regret that in the morning, let's just watch George of the Jungle