Similar to how dogs tag a tree or fire hydrant....
in humans, it's an act of vandalism where someone (primarily males) will urinate all over a bathroom.
Doorknob, sink, toilet, paper products... EVERYTHING!!! And it's super gross, bc the staff of the establishment has to clean it up.
That dude was so pissed he didn't get a discount on his nachos that he tried tagging the bathroom.... there's piss everywhere!
"Tagging" or "Tagged" - When you have sex with a girl and then take a picture of her naked, then wait a few days and post it to Facebook and tag her and all your mutual friends.
Awesome party! who are you tagging tonight?" "Did you see the girl I just tagged" "Did hear about Rachel? She got tagged.