1)Referring to an image, or variants of it, in which a soldier is holding a canteen and a caption which reads 'how about a nice big cup of shut the fuck up'. may have other phrases present, such as 'now here's to sugars now piss off', 'think before you say something stupid', or may be as is.

2)A somewhat cynical and safe-for-public way of telling somebody to shut it right away without the appearnace of being too offensive to others.

when you've done something so cringe you can't stop replaying it in your head and it stops you from getting on with your every day life