2. A man acting foolishly, disrespectfully, or pig-headed in nature.
2. A man walks up to a women in a bar, insists on buying her the cheapest, un-tasty drink possible, initiates conversation about how often he works out while intermittently flexing his peck muscles. After the women is clear about being un-interested he insists on her number and/or heading to his place that night. She gives him the cold shoulder and he proceeds to call her a "bitch", "whore", or other demeaning term. This is an example of a Man-tard.
"I think that girl pulled one of her mantards just now."
"See you later guys, gotta go work the mantards at the gym."
"My mantards are raging! I need a glass of milk!"