Contracted when someone sings a bad song and it gets stuck in someone else's head.
I totally got a Musically Transmitted Disease (MTD) from her when she started singing Rod Stewart. I can't get it out of my head.
by joshfromnc May 17, 2009
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Short for Moralistic Therapeutic Deism. Many people who self-identify as Christians are, in reality, MTD-ists. Core beliefs include (but are not limited to): Sin doesn't exist; You are perfect just the way you are; heaven is a state of mind; God just wants us to be good people; Jesus was a great moral teacher -- but that's it; Don't spread the Gospel.

This can be summarized with the acronym MUSHY:

Make sure not to believe anything that might be embarrassing
Under no circumstance should you defy the culture
Stay soft and pliable in all things at all times
Herald your moral superiority for everyone to see
Y believe the Bible tho lol
Don't be a MUSHY MTD.
by Timothy P. July 20, 2022
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A disease you get from eating or having sexual intercourse with a marshmallow
I'm going to marry a marshmallow then on are honeymoon I'm going to hump it and then eat it. I might get a MTD
by Swiss Roll of Swizterland February 13, 2018
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MTD stands for Master Tower Defense is a Roblox Gamer that involves the player placing a "tower" to protect the "base" from "enemies". The developers are doing their best to give players the best experience. The game doesn't allow P2W (Pay to win) you get towers by reaching higher levels instead of currency. There are currencies which are T and C currency, you obtained C currency by playing the "normal mode" and "rush boss mode" and T currency if you played "endless" mode. There are locked towers that you can obtain by doing a specific task which can be seen in the progress button on the right-hand side of the screen. The "task" is very useful in giving you XP to skip to higher levels and unlock more towers. Exploits are not allowed into the game and you might get banned for doing so. The official chat is in Discord and not in the official group. You can chat with other players, complain about bugs, make friends, and look for strategies to help you.
Player 1: When is the new update, dude?
Player 2: Next 2000 years?
Player 2: I think the devs are gonna buff endless again
Player 3: Bullshit, that's not gonna happen, the enemy spam is already painful
Player 1: Yeah
Player 7: Hey anyone doing wild west, I want that dead eye tower!
Player 10: What level are you?
Player 7: I am level 23
Player 10: LOSER
Player 1: Bruh
Player 2: Hey mod! BAN HIM
Player 3: nvm
Player 7: =(
Player 10: IM SORRY
Explainer: MTD means Master Tower Defense and it is a growing game in Roblox
by Topatation July 15, 2023
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