Not safe for 56K. Similiar to NSFW, NSF56K means that if you are connected to the internet via dialup, don't click on the link. Unless you have a lot of patience.

A portmanteau of carpe diem, a Latin phrase that means “Seize the Day!” and DM, which stands for Direct Messages. This word means seizing the day via DMs.

"Not safe for 56k." This term is used for something on the web that people on slow connections shouldn't mess with. Typically, this includes large images, video, or streams.

Web sites with large pictures often display NSF56K meaning "Not Safe/Suitable for 56K". Contrast with NSFW, "Not Safe/Suitable for work", used to mark questionable content should your boss be shoulder surfing.

Acronym: "Not safe for 56k"

A label on a link that will load a heinously huge web page or file. Said page/file will finish loading around the apocalypse on a 56k dial-up connection.

Abreviation for: Not Safe For 56K (modems)

Not Safe For 56K: containing more data than is sane to download via 56k modem. From "NSFW", relating to items that should only be looked at in a work environment, especially if the office is open-plan.