TNT
TNT definition by Slang.net - The Slang Dictionary
This page explains what the acronym "TNT" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Someone who ends a chat or email message with TNT is likely using it to mean "til next time." (And probably not using it to refer to explosives or a cable TV channel.) This person plans to chat with or email you again soon, to continue your conversation.
If someone sends you an email that ends with TNT, you may want to consider writing them back soon, since they're looking forward to hearing from you. Similarly, if someone ends a chat conversation with TNT, you should look for them the next time you're online, as they'd likely want to talk to you agin.