A memory that one has that one can never forget and every so often it comes around and you have to deal with it.
Man1:I saw my grandmas pie and I can't get it out of my mind it's tattooed on my brain.
Man2: It's your memory so don't give it to me.
Man1:I wish the brain had an erase botton.
When someone gets slapped across the face, in which a highly visible mark is left for anywhere from hours to days. Usually happens when parties clash. Basically getting tagged, only the "ink" is always red.
Unlike the imaginative explanations given, the definition goes way back to early machinists. After inspecting a finished manufactured or repaired part, the Toolmaker/machinist would
1 tighten all parts and screws (Screwed)
2 Use Blueing a blue paint lke stain that stuck easaly to metal (blued) and
3 Put his inspectors mark through the blue paint with a sharp scriber (tattooed)
The part has passed inspection, it's been screwed, blued and tattooed and ready for release from the machine shop.