Acronym for "close that tab." Usually used as a response to someone complaining about something they're reading on the internet, or as advice for someone who is falling down a particularly dark hole on the internet.
Rose: oh shit, i fell for thought catalog headline linkbait and clicked on '7 reasons most millennials reject feminism'
Delilah: ctt
Theodore: this lonely girl 5 miles away from me wants to chat
Delilah: ctt
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