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Used when chatting with a guy. Most often used at the end when the guy cuts of the chat abruptly, usually to masturbate. therefore you say mydo. and since i just made it up, they won't know what your talking about, well, til now
After a sexy conversation....

Guy: um... yeah.. g2g

Me: mydo!


*looks it up on urbandictionary*

Guy: >:O Hey!
by O_Xx May 24, 2005