Top Definition
STD monday is the best day of the week in the army. On that day, you get to have sex with anyone you want (hint, STD). It's usually on a Monday and tons of babies are conceived with in that time frame.
Stacey: OMG, I had sex with Phil on STD Monday and now I'm pregnant!

Tara: You shoulda used protection. Now your gonna end up with an Army Brat.
by Shawty b u f f <3 June 24, 2011
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