A Bo Tard is an extremely fat woman who you think you've had sex with but your penis was in one of her fat rolls the whole time and she just ended up with an ejaculation stain on one of her love handles.
"Man, can you believe that I had sex with her?" "You didn't have sex, she was just a Bo Tard!"
Bo tard is the next level above re-tard, often involves extreme acts of stupidity, ignorance and poor judgment.
Alcohol is usually contributing factor from being re tarded to being bo tarded.
"Man did you see that kid hit him self with that baseball bat?"
"Yeah man, what a fricken bo tard"
"The troop surge in Iraq is bo tarded."
"Word, Bush is a bo tard."