Tag gag
The act of frantically cleaning up your social network profile page image tags when a new member joins your network to avoid displaying incriminating / damaging / embarrassing information from the past. Especially the drunk / smashed photos, photos with 'objectionable' people, etc
My mom is on facebook and wants to be friends - I gotta tag gag!
gag tag
A faggot who vomits cum on other dudes dicks
That guy gag tagged all over my dick yesterday
tag gagged
To use privacy settings on social media to prevent a person from being able to tag you.
"She kept tagging me in Nickleback posts so I tag gagged her"